YouCube allows you to map YouTube videos onto an interactive 3D cube and then save it to a database so you can show your friends. As you spin around a YouCube, the sounds of the different videos fade in and out. The sound level will be adjusted depending on how much of the cube side is in sight. The only limitation is, you need to feed six YouTube videos to share your cube. Its fun!
More info: YouCube
Source:→ Google Blogoscoped