3D animation in yt3D to watch on any 3D TV or in Anaglyph even without glasses using " cross eyed " method.
If you have Sony, Samsung, Panasonic, LG or other 3D TV set then you can play the side by side format.
If you have 3D monitor e.g. Zalman or iZ3D then you can watch youtube 3D videos choosing the 'Row interleave' view style.
If you don't have any 3D equipment then you can even try the cross-eyed method without glasses.