Language/s: Python/Qt
IDE: Qt Designer/Eric4/Gedit
Project: cuteTube
Progress: 80% of features implemented
License: ?
Distribution: ?
Purpose/goal of project: Feature-rich YouTube client. Features include:

• Playback/Download/Upload of videos
• Search
• Standard YouTube catagories
• View and manage your YouTube account (uploads, subscriptions, playlists, favourites etc)
• Add comments and ratings to videos

UPDATE: I uploaded an early demo video to YouTube showing some of the features:

http://www.youtube.com/watch?v=qlGHuNxvNxA