U/Kubuntu with Kde4.1.3, I use Compiz Fusion as windows manager, and Emerald as decoration window. The emerald theme is "Soft & Clean".
plasma theme is Silicon, Icons are Oxygen Black Refit, and QT Style is Bespin, Really beautiful.
Plasmoids used are Analog Clock, Folder view, Log out, trashcan, and picture frame.
well, I'm emesene and firefox user, and these application are gtk based, so, install gtk-qt4-engine for integrate them..I have a little problem with the system tray in the panel.
Also, I Changed the menu button for a Kubuntu icon.
Good luck, Pol ;)