www.xp-erience.org
www.tweakxp.com
http://www.windowsxp.nu/
http://members.aol.com/axcel216/wxp.htm
These are some good resources for getting into what you can do with XP (both versions). A lot of tips are repeated, but if you have the time, you'll find plenty of help.
In the particular tip, they tell you how to reveal ALL the hidden options from the add/remove windows components. A quick google for "XP tweaks" will give lots of results.
RGDS