There is such a thing as a free lunch. I've managed to get my desktop to resemble Windows Vista, almost very exactly, without getting Vista at all!
Impossible you say? Well, here it is (click to enlarge):
Tell me, this doesn't look a single bit like XP, doesn't it?
Haha...this is the result of Vista Transformation Pack and some 3rd party add-ons! So if any of you is thinking of getting Vista just solely for the beautiful interface, save that few hundred bucks, because you can get that on XP, completely free.