Minimum Requirements: 1GHz CPU, 8MB 3D Graphics card, Windows 2000 Recommended Requirements: 1.5GHz CPU, 64MB NVidia Geforce FX or ATI equivalent, Windows XP (Windows Vista compatible)
Gesture Magic has been sitting on my PC for the last few months and hasn't changed much*, but by the end of next week you'll be able to get your mitts on it - for nothing - gratis - free!
Gesture Magic allows you to start programs or batch files by painting gestures on screen - directly on top of the desktop. Whilst this may not seem amazingly useful (especially when you could just use program shortcuts), it looks cool and with some configuration and some crafty batch file usage you could probably accomplish some complex tasks more quickly.
* Regrettably the code isn't great and is unfinished (i.e. prototypish so not a good example of C# code :( ), but so it doesn't rot I'll release it as GPL as bug fixed as I can make it. Feel free to build on it, but remember to provide the source.