This is a must have utility on all Windows machines. StrokeIt is a mouse gesture recognition program. Once you install the program simply right click and make gestures with your mouse to perform actions. For example I never have to move my mouse to the corner of a window to minimize it, I just make a small mouse movement and presto the window minimizes.
Some browse like Opera and Mozilla have mouse gestures built-in but Stroke It is truly unique in that it work on all windows. And the best thing I love is its small footprint (less than 200k). Stroke It is so cool almost everyone at my office uses StrokeIt. Get it here.