StrokeIt

Users of the Opera browser will already be familiar with mouse gestures, the revolutionary way to control the browser by making small movements with the mouse. Now, StrokeIt (ignore the terrible name) extends that feature to Windows in general.

Using mouse gestures, once the program is installed, is just a case of drawing a small symbol on the screen using the mouse, which is translated by StrokeIt into a particular command. StrokeIt can be customised so that you can choose the gesture, and choose the command to be performed.