To those of you desperately defending XP - why did you upgrade from Windows 2000?
I only upgraded to get media centre (MCE 2005 edition, four years after XP was released!) and still use the classic W2k interface. Also I still use W2k on my older PCs and servers.
For most people there has to be at least one 'must have' feature. It's no use having a number of 'nice' features it has to be a killer. For me even though I dual boot the only time I use Vista is for editing HD video where I need to use all 4gb of memory. I understand why the technology is supposed to produce a better OS but for Vista the whole is less that the sum of its parts.