A very nice Windows manger I’ve found is Enlightenment.
When I tried it on Ubutnu it sucked a bit. Okay, it seemed to have failed to do anything to the screen like the fancy screen shots I saw on the Elive distro
The Elive distro is quite nice but it seems Enlightenment needs configuring when you install it or to add themes on Ubuntu. I’m looking forward to trying out Ebuntu which is a Ubuntu based distro but with enlightenment rather than Gnome. (Much like Kbuntu or Xbuntu)
Something to keep an eye on I think. Reminds me majorly of Litestep for Windows.