mrd: Haha,
that's a copy of Apple's
Exposé, which wasn't an entirely new concept anyway, but the first time it was properly implemented IIRC. (Why are all my posts about Apple stuff?) It's definitely a cool feature, something that ends up becoming absolutely essential, and I was wondering how long it'd take somebody to hack something together.
It's always great to see innovative, original concepts surface first in OSS (Gnome seems to do this a lot, which is brilliant, and why it's my desktop of choice), but it doesn't hurt to bring good ideas to the masses. Let's just hope Apple didn't patent it, which is something they seem to like doing :-(