All new in Vista.
http://www.theregister.co.uk/2005/09/13/gates_vista/
So we have RSS, better searching and flipping windows. And who knows how much slower. Oh and they'll be porting bits of it to XP anyway.
If your getting a new machine with an OS installed it might as well be the newest one (if you can't get a bare bones machine) but I'm not seeing any compelling reason to change. Of course I thought that about XP until multiple programmes would only run properly, or at all, under it.
