I tried getting AIGLX and beryl working on my ubuntu box yesterday, but it seems that the graphics card on the machine isn't strong enough. I think its a really old ATI card, I don't even remember. Any case, when beryl starts up it complains about the texture size, and 25% of the screen is black. And I really wanted to try out the new dock.
And my friends wonder why in the world I would need a couple of more systems to play around with! :D