Google to Launch Picasa for Mac:
TechCrunch found from a Google employee that we should expect to see a version of Picasa for Mac later this year. "I asked if Picasa for Mac was coming, and as luck would have it I managed to pick the Google employee with the least amount of media training and immediately put her on the spot. Her response: Picasa for Mac is under-development and will be launched later this year."
For now, Picasa only works in Windows and Linux, using WINE. There's also a Mac uploader for Picasa Web Albums that lets you upload photos from iPhoto.
Google is increasingly concerned with supporting other operating systems than Windows: a single Google software works only in Windows - Google Talk, even though there's a limited web version.