AnalogX MouseMod

This program allows you to move the mouse on a grid and modify up to 4 continuous MIDI controllers in realtime.

You can control the direction of the controller information (0-127 or 127-0), the screen space used (entire grid or just half), and if the controller switches to another halfway through.
Mouse Mod works on all versions of Windows, from Window 95 to Windows 7 and everything inbetween including XP, Vista, Win2k, etc.