An interesting experiment created by a Googler in their 20% time has hit YouTube -- it's a 3D viewer for some YouTube videos. If you have a pair of 3D glasses kicking around, you're in luck.
If you want to brave the "Cross Eyed" view, go right ahead -- but I have to warn you, it's not easy on the eyes or the stomach. As cool as it was, I'm never doing that again.
Click here to start with the 3D experiments -- you can find more in the "related videos" on the right hand side.