I bought an XP 64bit machine about 18 months ago - put up a fight for about 12 months trying to get drivers to work with various hardware devices, used it as a doow stop for 6 months and just installed XP Pro (invalidating the warranty) and can now sleep at night.

I will let everyone else take on the early pains of Vista and take a back seat! perhaps I will try it when Windows Panorama or Horizon is released as the next version (devil)