Frankly speaking, I realy don't see any 'extras' in XP apart from some jazzed up UI (which hogs RAM), some really novice-like menus enhancements, etc.
The only plus point of Win XP I noted was: Faster hibernation and resume. Apart from the jazz and UI graphic improvements (and a few not really required shell improvements) - WinXP is just a jazzed up version of Win2K.
So the bottom line is - if you need a powerful OS, without all the jazz - go for Win 2K. If you prefer more of UI jazz, go for XP. You may even want to check out Microsoft's Windows comparison site at:
http://www.microsoft.com/windowsxp/p...eaturecomp.asp
But as far as stability, etc go, Win2K is as good. As I said earlier there's nothing that WinXP can do that Win2K can't. It may be possible that WinXP comes with integrated utilities, but there are always (much better) third party options available.