I've just spent hours in PC world, and other places.
Have you tried to buy a pc without Vista? They won't sell you one, unless you open a business account.
I've just been told "You invalid your warranty on the PC if you install XP on it." by some oddbod in one of their stores.
Consequently, no pc. This is a pity, because I was going to buy four, as I'm doing a house refresh. No XP, no PC.
This is abuse of market position, surely.
It's also a real pity, because there's some total monsters out there these days.
Vista needs a switch to remove UAC, all the stuff that hangs, indexing, search, all those pictures. As was put very well recently, I want a computer that I chose to run media player on, while I'm writing emails, building databases, surfing the web, and writing code. I do not want some kind of funky telephone interface that allows me to do a few thinks like those, badly.
It's a computer first, experimental arty modern communications device second, not the other way around.