I use Celena. It's very easy to use nvidia and beryl (thanks) so it works fine.
But, I can't (or don't know) how to have the "cube effect" !!!
On Ubuntu, I could have multiple desktops (on one monitor) and I don't know how to add some to Celena...
Maybe that's the reason why the "cube" doesn't work.
(Ok, I know you've to use ctrl+alt to move the windows but when I try to drag one outside the screen I don't see the cube).
(sorry for my english, i'm french
Oh, I was about to forget : Happy chrismas to everybody ;-D