vista isn't as bad as alot of tech sites make it out to be.
it's main problem is compatibility with devices such as printers, etc.
its a big problem, but other than that vista is pretty sweet.
a few annoying things though:
that bar at the top that goes "file, edit, view, etc." isn't there anymore. some applications have the option to turn it back on but usually hard to find.
office '07 looks completely different, i felt like a n00b again until i got the hang of it.
all in all, vista is sickeningly user-friendly. if you can handle it, upgrade.
i'm sticking with XP until DX-10 is an absolute nessecity.