A Google employee has a working prototype of what 3D videos would look like on YouTube.
'YouTubePete' said in a YouTube forum thread that he's the developer working on making a stereoscopic player during his '20 per cent time' at Google.
A sample video, which was dug up by Search Engine Roundtable, can be found on YouTube. We happened to have a pair of 3D glasses lying around, having recently tested the Minoru 3D webcam, and, when we finally found the correct mode in the drop-down menu to the bottom right of the player, we did indeed see 3D. It was grainy and dark, but it worked.
YouTubePete reiterated in the forum thread that the 3D player is just a side project, but he's taking feedback if you have suggestions.