I'll continue to use XP and 2000 on my machines until I need a feature in Vista. But naturally, I won't go rushing to update my systems. I think i'll wait a year after release. Christamas 2007 maybe.
It's absolutely perfect for my computer. Especially as it's not particularly modern. PIII 667 Mhz 128 Mb RAM Riva TNT 2 Pro 20 Gb HDD Windows XP ( so i'll need all the RAM I can get!)