Mobile YouTube Application:
YouTube updated its mobile site available at m.youtube.com to include all the videos from the desktop version and to provide access to your account, the option to rate videos and post meaningful comments. To use the mobile interface, you need a phone that is able to stream 3GP files over RTSP.
But there's a better way to play YouTube videos from your mobile phone: a Java midlet currently available for some phones from Sony Ericsson (K800, W880) and Nokia (S60 3rd Edition phones: N73, N95, E65, 6110, 6120). The JAR file for Nokia phones can be found here, in case you want to test it on unsupported phones. YouTube's mobile application also lets you upload videos from your phone. To install it, just go to m.youtube.com/app on your phone and follow the steps described in YouTube's help center.
"You may be wondering, Is YouTube for Mobile the same as what's available on the Helio Ocean or Apple iPhone? In a nutshell, yes -- YouTube for Mobile is all about bringing video to mobile phones. We believe in providing the best user experience possible for all users, which in some cases means different YouTube solutions for different phones," explains the YouTube blog.