I use Rocketdock (Stardock was hinky on my P4), & put the taskbar on the top of the screen. If you can easily skin Vista like you can XP, LutetumGUI looks great on the various machines I've tried it on.
Another option is to use Leopard Transformation Pack although I'm a bit weary about using transformation packs. make sure you've created a restore point before moving ahead.
