TweakUI – You can have all sorts of control over XP with this simple utility. Control your Desktop, how users logon, what drives show up and how they handle media … this is just a taste of what is possible with TweakUI. Later this month I will show you some tricks with this utility that will really change the XP experience.
Clear Type Tuner – This works good for getting text on your monitor to look more clear and sharp. I find this especially handy with older monitors.
Power Calculator – enhanced functions of a scientific calculator with the ability to graph points, do algebraic expressions among many other mathematical features.
This is just a sample of the many power toys available for XP. You can view all of them here.