A buddy of mine sent me this link
http://www.blkviper.com/WinXP/servicecfg.htm

It's a great site giving you the lowdown on all the services running under XP (and 2k/ME) and giving suggestions on which you can shut down to improve preformance.

disclaimer:
This is not my site, nor am I affilated with the guy running. If you blow your install up don't come crying to me [img]tongue.gif[/img]