Tweak XP
Totalidea software: tweakvi, tweakvista, tweak-xp, tweakxp, free windows vista tweaks, windows xp tweaks, outlook add-ons, outlook backup, outlook notes
http://www.totalidea.de/
XP PowerToys
Get help and support for windows xp, and see how it can help you accomplish your favorite things.
http://www.microsoft.com/windowsxp/pro/downloads/powertoys.asp