Compiz - this is merging with Beryl.
Items marked with (nyt) indicate I have not yet tested it. I've heard
it's good (so it has made it on the list) but have not yet tested it
myself.
If you are ever looking for some amazing eye candy for Linux, try Beryl. On fedora 7 beryl installs easily by issuing a “yum install beryl*”. You can then use Beryl on your favourite window manager (such as kde) by selecting System -> Beryl Manager from your menus.