problem with that is that they're the M$ protection, running it, and xp becomes safer, and performs better, so xp would still be better(this is talking about a mid-low level pc though, more then 2 gigs of ram, a good dual or quad core proc, and a new gen grphx card would have vista perform better, probably).
i'm always a fan for dual or multi boots, i used to run with a xp-xp-ubuntu studio combi, and was doubting if i should have added vista, if ubustu would've worked properly, it would have had use, as i'm big on sound editing, but like this, i ended up just using 1 xp, so i removed the rest.
and dont forget there's programs to enhance the visual aspect, like stylexp, and stuff to emulate stuff like the thing from mac at the bottom(objectdock, rocket dock, and so on).
and great programs like taskbar shuffle, which lets you reposition your programs on your taskbar, and trayicons on your systray.