Theres a gazillion threads on it
2000
NO STINKING WIZARDS!!! arghhh they kill me!
I don't feel like a 3 year old on a tricyle
MUCH Lighter on resources
MORE stable
Less BS services installed on default that only a handful of people will use (portable media serial number thingie.. wtf?!?)
When I go to control panel I want to go to the control panel! Not the pretty version that you gotta dig through to find the real stuff (yes I know you can change this, but it is still an annoyance)
XP has its perks... they're just few and far between IMO

Short on time, these are just on the top of my list