Dunno if this too relevent for what you are looking for, but you cab also get a windows7 superbar skin, Aero themed explorer windows and start menu for XP from http://lee-soft.com/products/

http://www.youtube.com/watch?v=KzTbG...embedded#at=99

I have been using this for over 18months now on my works PC and this is a god send when running 30+ windows at a time.