The Black Google Homepage
Google's homepage is black for the users from United States, United Kingdom, Ireland, Canada and Denmark to promote Earth Hour, an event that encourages energy conservation. "On Saturday, March 29, 2008, Earth Hour invites people around the world to turn off their lights for one hour – from 8:00pm to 9:00pm in their local time zone. (...) Given our company's commitment to environmental awareness and energy efficiency, we strongly support the Earth Hour campaign, and have darkened our homepage today to help spread awareness of what we hope will be a highly successful global event," explains Google in a special page created for the event. Earth Hour started last year in Sydney, but this year many cities from all over the world joined the event.
The purpose of the black homepage is not to save energy, but to raise the awareness of the world's environmental problems. Most people will be surprised to see Google's homepage so radically different and will start to wonder if it's a good idea to imitate Google's blackout. Sometimes small actions make a difference, but in this case the key is elsewhere.
Google's Asian Homepages
Google China is the third international Google site that has a new homepage, radically different from the simple homepage that became a part of Google's identity. Google China's homepage uses animations to display icons and small descriptions for Google services like: Image Search, Google News or Dao Hang.
The other two similar homepages are for Google Korea (launched on June 12, 2007) and Google Japan (launched on March 21, 2008). Google China Blog says that the three homepages were a part of bigger project meant to improve Google's interface and to adapt it to local cultures. For example, Chinese users found it difficult to navigate to other Google services, since they were listed on a different page, so Google decided to place the links more prominently on the homepage.
I liked the last paragraph from Google China's blog post (or its automatic translation, to be more exact):
The change in the Asian region in the entire Home Google is a major patron saint Google Home Marissa has given us the greatest help, and this was her first "replacement" Movement biggest supporters: "You can change as much as possible "of this so let us encourage the Google home page of this classic too bold move from the surgery. Google Home is not static, but, as she insisted to the interests of users, she is also due to the change and you change.
Google already provides an alternative to the "classic" homepage: iGoogle, but the default homepage hasn't changed too much over the years.
Restore Task Manager, Regedit and Folder Options Disabled by Virus
Let's face it. All of us have been infected by virus before. Even if you have anti-virus installed, you can still be infected by a new or custom virus that is not recognized by your anti-virus. Sometimes after removing the virus completely from our system, you'll face new problems such as you can no longer bring up Windows Task Manager from CTRL+ALT+DEL. You get the error message saying "Task Manager has been disabled by your administrator".
Task Manager has been disabled by your administrator
You think that it's easy to fix this problem by going to Registry Editor but you can't! You get the error message "Registry editing has been disabled by your administrator".
Registry editing has been disabled by your administrator
Folder Options and even Show Hidden Files & Folder is disabled! How frustrating! Don't worry, here's how to restore your Windows Task Manager, Registry Editor, Folder Options and Show hidden files & folders.
This problem is most commonly caused by a virus called "Brontok". Brontok virus will make some changes to the system restrictions in order to hide itself from easy detection and also from easy cleaning.
Here's a free tool called Remove Restrictions Tool (RRT) which is able to re-enables all what the virus had previously disabled, and gives you back the control over your own computer.
Restore windows restrictions
Remove Restrictions Tool is able to re-enable:
- Registry Tools (regedit)
- Ctrl+Alt+Del
- Folder Options
- Show Hidden Files
Small and easy to use. Make sure you boot in to Safe Mode to use Remove Restrictions Tool (RRT). Just click on the buttons and it'll do it's job.
Download Remove Restrictions Tool (RRT)
Google Street View Gets a New Update
Google Street View added imagery for 13 more US cities and for the Yosemite National Park. The new cities are: Albuquerque, Anchorage, Austin, Cleveland, Fairbanks, Little Rock, Madison, Nashville, Rockford, Richmond, Spokane, St. Petersburg, Tampa. The total number of places where Street View is available has increased to 48 and it's likely that Google will add imagery from outside of the US in the near future.
Street View can now be added to any Google Maps mashup since the API supports it. "The API allows you to embed one or multiple panoramas in any location on a site and move, remove, hide and unhide them as necessary. Panoramas can also be easily integrated with the rest of the Google Maps API to allow synchronization between the map and the panorama viewer," explains James McGill, from the Maps API team. And instead of posting screenshots, you can embed the full panoramic views by clicking on "Link to this page" and copying the HTML code in your site.
View Larger Map
YouTube Shows Stats for Your Videos
Now you can find some basic statistical data about the videos you've uploaded to YouTube. For each of your videos, you can view a chart that shows the number of daily views and the evolution of your videos' popularity. The stats can be restricted to a continent or to a country and you can also see the countries where your videos are more popular.
"How does this help you? Well, using these metrics, you can increase your videos' view counts and improve your popularity on the site. For instance, you might learn that your videos are most popular on Wednesdays, that you have a huge following in Spain, or that new videos that play off previous content become more popular more quickly," suggests YouTube's blog.
The analytics data is really basic and doesn't include a lot of interesting information like the sites that embed your videos, the most important sources of traffic, how many people view the full video or play it again etc.
To find your video stats, go to your YouTube account and click on "About this video".
Google to Add Language Translation in Gmail
ComputerWorld reports that Google intends to integrate its language translation service in Gmail and Google Talk. There are already bots that could facilitate an IM conversation with a person that speaks a language you don't know, but it would be much better to have the feature built in. Even if the translation is far from perfect and often incoherent, you'll understand the main ideas.
"What you need for real-time automated machine translation is large amounts of compute power, which we have, and large amounts of data, which we have. Imagine a system that can do on-the-fly translation of things like e-mail, documents and IM chat. That's a feature you can see on the horizon," said Google's Matt Glotzbach.
Apparently, Google is also developing tools for videoconferencing "to augment internal training programs and to serve as a hosted alternative to pricey videoconferencing software". Last year, Google acquired Marratech's video conferencing software.
In the past few years, Google started to preannounce features and services, but they were either released late or not released at all. We're still waiting for phone calls in Google Talk, tasks in Google Calendar, Gmail folders, Knol, Google Health.
Google Sets, the Search Engine for Lists
SEO by the Sea points to an interesting patent that describes how Google Sets works. Google Sets is one of the first services that were added to Google Labs and it's a cool way to find list of related terms. Google Sets is a tool that generates lists from a small number of examples by using the web as a big pool of data. You enter some items and Google Sets finds other items that tend to co-occur frequently with your examples. For example, you could enter Barack Obama, Hillary Clinton, Rudy Giuliani and get a list of US presidential candidates.
One particular type of information often present on the web includes lists, such as lists of restaurants, lists of automobiles, lists of names, etc. Lists may be identified in a number of different ways. For example, a list may include an ordered list or unordered list. Special tags in a HyperText Markup Language (HTML) document identify the presence of ordered and unordered lists. An ordered list commences with an <OL> tag; whereas an unordered list commences with an <UL> tag. Each item in an ordered or unordered list is preceded by an <LI> tag.
Another type of list may include a definition list. A special tag in a HTML document identifies the presence of a definition list. A definition list commences with a <DL> tag. Each item in a definition list is preceded by a <DT> tag. Yet another type of list may include document headers. Special tags in a HTML document identifies headers using <H1> through <H6> tags. Other types of lists may be presented in yet other ways. For example, a list may be presented as items in a table or as items separated by commas or tabs.
After identifying lists on the web, Google generates a probabilistic model from the examples provided by users and classifies the lists according to the model. The items are assigned weights based on the classified lists and the weights are added to form a list based on the total weights.
Colored Folders in Google Docs
Google Docs lets you select a color for each of your folders, a feature that has been previously available in Gmail. The color will be used to represent a folder in the sidebar and in the document list, so you can easily spot related documents.
Another new feature, this time available only for documents and presentations, empowers you to change the owner of a document. Unlike simple collaborators, the owner of a document can delete it and can restrict the access to a document for some collaborators. This page explains the difference between viewers, collaborators and owner. To become a collaborator and transfer the ownership of some of your documents, select them from Google Docs homepage and choose More actions > Changer Owner.
Judging from the source code, Google Docs will include an option to add collaborators with limited rights - they won't be able to download a document, change its settings, share it or publish it. Creating user groups with custom permissions could be an even better idea.
Google Tests Video Ads Alongside Search Results
Google Tests Video Ads Alongside Search Results:
In February, we found out that Google intends to test video ads next to search results and now we can finally see some examples. Digital Inspiration spotted an AT&T ad targeted to the query [phone], but there's also an Intel ad when you search for [laptop]। Google uses plusboxes to show that there's a video ad that complements the text and labels them with messages like: "watch commercial", "watch demonstration", "watch testimonial".
The video ad is triggered only after you click on the message and it's a small 160x140 video that uses the Google Video player। The ads are very short (around 30 seconds) and they end by displaying a clickable URL to the landing page.
Google Docs Gets a Menu
After updating the toolbar, Google Docs replaced the tabbed interface with a traditional menu. The File menu looks cleaner and integrates the revision history, the Edit includes some of the options that are missing from the toolbar (cut/copy/paste) and also the HTML code editor. It's amazing to see that Find & Replace is still in alpha and doesn't work as advertised. The Insert menu has the same features as the homonymous tab, Format replaces the Styles dropdown, while Tools lets you select the document's language, check the spelling and read stats about the document. The Table menu was previously available as a contextual menu for tables and there's a new Share drop-down that integrates the options to share a page, publish it on the web and preview it.
Google Docs includes all the menus from Microsoft Word 2003, except for View, Window and Help, but there's enough room to add more menus in the future. The team's blog explains the changes by invoking a user study, but the truth is that most people are used to Microsoft Office's classic interface:
A while ago, our Docs User Research team worked on a "card-sort" study in which we disconnected all features in the application from the places we had put them in the UI, and asked some people what the labels and icons meant to them, and how they would group the concepts they represented. One of the things we found was that names such as File, Edit, Format, and Tools resonated as "where you might look" for certain editing features. Check spelling? Seems to fit in a "Tools" group to many people. Find and replace? People generally look for that in an "Edit" group.
These updates are only for the word processing application, as Google Spreadsheets and Presently continue to use the old interface. Having an unified interface and a set of features that work consistently in all the three applications should be a priority for Google.
PicLens, Full-Screen Slideshows for Image Sites
PicLens is a browser add-on that detaches the images from a web page and lets you explore them in interesting ways. The add-on, which is available for Internet Explorer, Firefox and Safari, works for a small number of sites: image search engines and photo sharing sites, as it requires to understand the structure of a web page.
PicLens is a great way to visualize the results from Google Image Search as a never-ending list of thumbnails. Once you find an interesting photo, you can double-click on it and view it in full-screen. PicLens can also create slideshows from Google Image Search's results so you can enjoy Dali's paintings or Google's doodles.
For Picasa Web Albums, the slideshow doesn't include captions or file names, but it lets you navigate inside an album. The slideshow also works for Picasa Web's search results and it shows the images in full-screen.
Yahoo to Support OpenSocial
Yahoo seems to be all about openness lately (Open Search, support for OpenID), so the announcement that the company intends to support Google's OpenSocial initiative shouldn't surprise anyone. OpenSocial is an API for writing social applications that work across multiple sites and many social networks started to work on implementing it: MySpace, hi5, orkut. From Yahoo's blog:
Yahoo! has always been about helping users find and share information online, and we love giving our broad and loyal developer community the tools they need to keep innovating on this front. Their echo our passion for creating the best Web experience for our users.
In this same spirit, we announced today that we’ve joined forces with Google and MySpace to create the OpenSocial Foundation, and will also begin supporting the OpenSocial standard. Industry consortiums such as this often start slowly and evolve over time. So far, OpenSocial is rapidly growing and adapting, but still in the early stages. We feel that this is the right step at this stage in its evolution. It’s no longer a trial balloon — it’s for real. We are taking this opportunity to help ensure websites and developers feel confident using OpenSocial as the building blocks for their new social apps.
OpenSocial Foundation has a web site that uses the recently launched Google Sites. The foundation will make OpenSocial more neutral and closer to becoming a web standard. According to a press release, "the OpenSocial Foundation will be an independent non-profit entity with a formal intellectual property and governance framework; related assets will be assigned to the new organization by July 1, 2008. The foundation will provide transparency and operational guidelines around technology, documentation, intellectual property, and other issues related to the evolution of the OpenSocial platform."
Two weeks ago, MySpace launched a gallery for OpenSocial apps, hi5 will officially open its platform on March 31st, while orkut has delayed the launch. Hopefully, this is the first step from a bigger initiative of making social networks more open and less self-centered.
Search for iGoogle Themes
With more than 360 themes, iGoogle should have something for everyone. From Chinese floral designs to clean green, from raspberry cakes to an yellow Escher theme, from intricate patterns to Mr. Bison's quirky days, from pink flowers to dark summers, from Studio Ghibli to the Yellow Lab Puppy, users have created great themes.
Now you can actually find some beautiful themes using the new search box: for example, searching for [dynamic], you'll find themes that change throughout the day
Expandable Google Search Box
If you entered long queries in a Google search box, you would notice that it's difficult to edit them because Google optimized the size of the box for short queries. Things have changed and now you can much bigger queries and Google will adjust the search box's size after you perform a search.
Google limits queries to 32 words, but most people don't need that many words. The average number of words in a Google query was 4 at the end of 2007.
Here's a comparison between Live Search, Yahoo Search and Google Search for the query [how do you distinguish between a 64 bit and a 32 bit operating system], one of the most popular queries that start with "how do you".
Custom Google Search
Google has been experimenting with letting users reorder and remove search results. This may seem strange if you think that Google cares a lot about algorithmically ranking search results. The new options allow you to promote some of the results at the top of the page, hide the results you think are not relevant and add new web pages that are missing from Google's results. These changes are saved in your Google account and only influence your results. For now, the users who see the experimental feature are randomly selected.
These new personalization options can be partly recreated using a custom search engine. You can build a custom search engine for the entire web, that should include all the sites from Google's index. Every time you find web pages or web sites that are not very useful, but have good rankings, you can edit the search engine and them to the exclusion list.
To promote search results, check this option in the custom search engine's settings: "Add my Subscribed Link to this Custom Search Engine". Then create subscribed links for some of the terms you search often. Alternatively, you could use Google Spreadsheets to define a list of subscribed links. The subscribed links are also included if you use Google's standard search engine, but they're displayed after the third search result.
The custom search engine lacks the user interface options from Google's experimental feature, but it's a pretty powerful way to customize your search experience.
Useful Google Translate Addresses
Translate a web page:
http://www.google.com/translate_c?langpair=LANG1LANG2&u=URL
Example: http://www.google.com/translate_c?langpair=iten&u=http://www.corriere.it/ translates Corriere della Sera's homepage from Italian into English.
Translate a web page into English (the input language is detected automatically):
http://www.google.com/translate_c?langpair=en&u=URL
Example: http://www.google.com/translate_c?langpair=en&u=http://www.corriere.it/ translates Corriere della Sera's homepage from Italian into English, but without explicitly mentioning that the web page is written in Italian.
Use Google Translate as a proxy:
http://www.google.com/translate_c?langpair=LANG1LANG2&u=URL
You basically want to read the page in its initial language, but loaded from Google's servers. LANG2 should be the code for your web page's language, while LANG1 can be any supported language so that LANG1LANG2 is a valid language pair.
Example: http://www.google.com/translate_c?langpair=fren&u=http://craigslist.org shows Craigslist's home page using Google Translate as a way to bypass security restrictions.
Translate a text:
http://www.google.com/translate_t?langpair=LANG1LANG2&text=TEXT
Example: http://www.google.com/translate_t?langpair=enes&text=Hello, world! translates "Hello, world!" from English into Spanish.
Notes:
1. the language pairs are listed in this FAQ, while the language codes are included in this long list.
2. To disable Google Translate's annoying tooltips that show the original text, block this JavaScript file: http://209.85.135.104/translate_c.js, for example by adding a new rule in Adblock Plus for Firefox or by using Opera's content blocker.
Google's Design Guidelines
Jon Wiley, User Experience Designer for Google Apps, outlined some of the most important principles for designing interfaces at Google. In his presentation at the WritersUA conference, Jon listed the following guidelines:
Google Analytics Benchmarks
Two weeks ago, Google Analytics added a new feature that lets you compare your site's traffic with average data for other similar sites. To make this feature possible, you need to enable data sharing with the benchmarking service. "Google will remove all identifiable information about your website, then combine that data with hundreds of other anonymous sites in comparable industries and report them in an aggregate form." There's also an option to enable data sharing with other Google services that will allow a better integration between Analytics, AdWords and other services.
The benchmarking data is now live and you can see it if you go to Visitors > Benchmarking (Beta). Google compares the following values for the last 30 days: visits, page views, pages/visit, bounce rate, average time on site and new visits. By default, your site is compared with other sites of similar size, but you can restrict the benchmark to general categories like: Internet, Travel, Shopping, Reference etc. Since the data is aggregated from the sites that agreed to participate in the program, it may not be representative. Google says it will add new categories once more sites will enable the data sharing option.
"When benchmarking is enabled, Google crawls the websites in the account then categorizes them by vertical and the amount of visits. The data is then made anonymous through aggregation. For sites of a similar size, a category of industry verticals can be chosen when there is a sufficient number of accounts in that category."
It's interesting to compare your site's traffic with these aggregate data as it will help you put things in perspective, but you shouldn't be disappointed if the comparison is not favorable. Each site is unique and has a different raison d'être.
Google's Broken Bookmarking Systems
Google's Broken Bookmarking Systems: In this guest post, Michael Searcy expresses his frustration with Google's failed attempts to develop a service for bookmarking and sharing web pages.
Reader: It is awesome. It has changed my life! I find and share more stuff with it, than with normal browsing. You can "star" items that you want to lookup later for reference, but if you want to bookmark something you have to invoke some hackery (you can open the item outside of reader and bookmark it with a toolbar shortcut, or use a Greasemonkey script which doesn't work). Another limitation not shown in the chart is that you can't share anything you are not already subscribed to. Also on a shared reader page you don't get a summary view (for people with lots of posts), you can't search and you definitely cant slice it up by tags/labels. Shared stuff: It's interesting because if you find something cool in Reader you can star it, then later when you get around to reading it again you can open it separate and bookmark it. Then if you open it from your bookmarks you can use the Email/Share toolbar item to Share it and it will Show a "star" saying its bookmarked. Other cool aspects are that you can Share through Google, share through other social networking services, email it to your low-tech friends, and you can even tag your items! You can do all that, but you can't bookmark with Google Bookmarks? You can use every bookmark service except Google. You're kidding me right? So now we can share bookmarked Items in a round about way, but we can't bookmark shared items!!! Notebook: Its nice for a web notebook/clipboard with multiple headings or "notebooks" (which is repetitive but that's what they are called) and the sharing function is nice, if your into sharing notebook type content. Then they tried to incorporate bookmarks, but they imported them and called them "Unfiled Bookmarks", which means it's a bookmark and it's not associated with a "notebook". Which is extra weird if you "move" a bookmark to a notebook. Then you get your Markbooks confused with your Booknotes and ..... Wait. This is just madness. Its just 2 different classes of labels. But you can share "notebook" class labels but not "labels". So close. | ||||||||||||||||||||||||||||||||||||||||
Google Translate API
Google Translate API: Google launched another AJAX API, this time for language detection and translation. The API works for the same language pairs that are available at Google Translate and lets you display the translation of a text inside your own page, without having to link to an external translation service. The translation API could be used to automatically translate some content from a web page using the browser's preferred language, to create a Greasemonkey script that translates to English the posts written in other languages, to detect if a comment is written in English before posting it and for many other things. Here's one example of use, where you can enter a text in one of the supported languages (Arabic, Chinese, French, German, Greek, Dutch, Italian, Japanese, Korean, Portuguese, Russian, Spanish), Google automatically detects the language and it shows the English translation. The sample text is from Le Monde. |
Google launched another AJAX API, this time for language detection and translation. The API works for the same language pairs that are available at Google Translate and lets you display the translation of a text inside your own page, without having to link to an external translation service.
The translation API could be used to automatically translate some content from a web page using the browser's preferred language, to create a Greasemonkey script that translates to English the posts written in other languages, to detect if a comment is written in English before posting it and for many other things.
Here's one example of use, where you can enter a text in one of the supported languages (Arabic, Chinese, French, German, Greek, Dutch, Italian, Japanese, Korean, Portuguese, Russian, Spanish), Google automatically detects the language and it shows the English translation. The sample text is from Le Monde.
Keep your RAM always free
Sometime when we close some program Explorer does not immediate unload DLL files from the memory.
The DLL files still resident in the memory for a while and do not let the another application to use the memory in their position.
I will guide you to unload them from the memory as fast as we close the application to make the memory always free.follow these step :
1. Navigate to start>RUN>Type regedit>OK
2.Browse the register editor to HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Windows > CurrentVersion > Explorer
3.Create a new DWORD Value and define its name to AlwaysUnloadDLL then enter 1 into the value box.
4.Restart your PC
DONE !!
Content Copy Protection
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Both services include integrated case tracking to manage your responses to multiple instances of plagiarism.
Faster Google Search on Your Mobile Phone
Searching the web using a mobile phone is not always a pleasant experience. You have to open a browser, go to a search engine, wait for the page to load and type your query. Google tried to eliminate two of these steps by providing small applications that add Google's search box on the phone's home screen. This way, the search box is always at your fingertips and you won't have visit Google's homepage to type your query.
Google Spreadsheets Adds Gadgets, a Directory of Features
Google Spreadsheets, the most mature application from Google's online office suite, has suddenly become much better.
Now you can get email notifications when your collaborators make changes or edit some specific cells. You can also get notifications when someone submits new data using a form.
Evaluating Google Search Quality
A leaked copy of Google's quality rater guidelines (PDF), used internally to evaluate the quality of search results, reveals some interesting things about Google's approach to search. "According to the document, which is dated April 2007 and at least looks legitimate, a quality rater has the job to first research and understand a specific search query – say [cell phones] –, to then look at the quality of a website returned for this query," notes Philipp Lenssen.
Explore Your Interactions with Google Reader
Web applications track many user actions and use them for different purposes: improving the products, finding patterns, building user profiles etc. For example, Google Reader records some of your actions without providing options in the interface to access the data. Here are some addresses where you can find historical data about the items you've subscribed to (click on "View all items" to see all the posts).
Add, Edit and Delete Places in Google Maps
After adding an option to edit locations, Google Maps allows people to add places. The option seems to work only for the US and you can enter few details about the local business or the place: address, name, phone, website and category. Google promises that "once you save your place, the whole world can find your addition by searching for it within a few minutes."
To find this feature, go to Google Maps, search for an address (e.g.: Madison Ave, NY) and you'll see a new option in the left sidebar: "Can't find what you're looking for? Add a place to the map."
Don't Talk About Blogger's Comments
(Based on a real song/movie/book.)
And you open the page and you step inside. It's an interesting post from a Blogger blog. After reading it, you want to post a comment and share your opinion, but there's no contact form. A strange link invites readers to "post a comment" and you reluctantly click on it. The link sends you to a web page from a different domain where you are supposed to enter your comment, but the comment form is too small and you can no longer see the original post unless you click on a barely visible link. For some reason, Blogger asks you to log in and it's not obvious that you can post a comment without having a Google account. Oh, and there's a difficult to read CAPTCHA you need to solve before clicking on "Publish your comment".
After all this trouble, the comment has been finally posted. Blogger forgot to auto-link your URLs, but that's no longer your problem. The big question is how to get back to the post. You want to give up and close the tab, but you notice a subtle message: "Your comment has been saved. It may take a moment for your comment to appear on the site at the original post." The last three words are linked so maybe clicking on the link will send you back to the original post.
Congratulations! You've managed to post a comment on Blogger. If this your first comment, it's likely it will also be the last one. "You are not a beautiful and unique snowflake. You are the same decaying organic matter as everything else. We are all a part of the same compost. We are the all-singing, all-dancing crap of the world."
Useful Content Restrictions for Yahoo Search
Google's advanced search options are useful, but they could include ways to define more restrictions for search results. Maybe you want to find pages that mostly contain text, web pages that reference videos or include tables. Fortunately, some these features are available at Yahoo, where you can use the feature: operator.
iraq gdp feature:table - web pages that contain tables, unfortunately including layout tables
la traviata feature:audio - web pages that link to audio files (e.g.: MP3s)
michel gondry ads feature:video - web pages that link to video files (e.g.: QuickTime videos)
AJAX feature:acrobat - search results that link to PDF files
beatles feature:activex - search results that contain the object tag (e.g.: embedded YouTube videos or any other Flash object)
feature:activex site:googlesystem.blogspot.com - all the pages from this blog that include videos
You can also use the operator to remove some classes of web pages. If you want to filter web pages that use JavaScript, add -feature:script:
java -feature:script - old tutorials for Java
lagrange interpolation demo -feature:applet - interpolation demos that don't include Java applets
To find web pages that link to files with a certain extension, use the linkextension: operator. For example, linkextension:ogg bach finds web pages about Bach that link to .ogg audio files.
Yahoo has another interesting operator (depth:) that lets you define the maximum number of subdirectories from your search results' URLs. For example, a search for google tips depth:1 will include www.google.com/help/features.html because it has a single directory, but not www.techcrunch.com/2007/01/04/google-tips-pulled, which has three directories. This could be useful to find web pages that are important relatively to the structure of a web site.
The operator has a special value that lets you search only homepages: -1, as you can see in this query: flickr depth:-1.
I don't know if Yahoo's search engine is better than Google, but Yahoo inherited a lot of interesting features from AltaVista and Inktomi, two leading search engines in the '90s.