Did you see the new look of Wikipedia?
Everybody's favorite encyclopedia have introduced new Look and feel, Navigation, Editing improvements, Link wizard, Search improvements, Pediapress book creator and Updated Puzzle globe and wordmark. These improvements were running in beta mode and accessible to the development team only. May 13th, 2010 introduced it to everybody. You can give feed backs or suggestions in the official blog:
http://blog.wikimedia.org/2010/05/13/a-new-look-for-wikipedia/ 