I got XP installed and patched on my MacBook Pro today. It took all day because I was doing real work on my Dell. :)
I think I will go ahead and put Vista pre-Rc1 on it when it drops.
So far it is pretty impressive, but I think the keyboard on my Dell D600 kicks its butt (so does the one on my old iBook). It is too bad they paid more attention to "look" and not attention to "feel" on the keyboard.