sailer
Splendid
purplerat :
Where Vista has an advantage is that it's 64bit version is a legit OS comparared to XPx64. Going from Vista32->Vista64(Ultimate comes with both versions) is a seemless transition. In my experience XP Pro -> XPx64 is a nightmare.
I find this strange. I've had XP 64 Pro on my business computers for a long time and have found no problem with it. I'm ordering another copy before they run out because I like it so well. There were some early driver problems, but those were all cleared up as Vista approached its launch. During the past year, all the driver problems disappeared completely. Now I like it better than 32 bit XP Pro.