Love the stereographic player on YouTube!  Just uploaded a cross-eyed (R/L) 2560x720 movie and added the tags yt3d:enable=true & yt3d:aspect=16x9

Works great!  Check it out.  The only Issue is my 8 Processor Mac has trouble playing back  HD in Full Screen mode.  It doesn't play smoothly- It's a choppy lowered frame rate. . . anyone else noticing similar problems?

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