Using KDE now.
Things are getting beauty on this desktop environment, thanks to Dolphin, SuperKaramba and the new Crystal icons.
It's good to see that finally there are people who cares about usability on kde and other open source projects like Gimp (yeah, Gimp 2.3 is much better in usability than predecessors).
update: added Kubuntu Gutsy wallpaper
update2: added more recent shot (#3)