Ambidexter Mouse
"Ambidexter Mouse" is a utility that can let you mousing in both hands very conveniently. Mousing ambidextrously can effectively release pains that called as RSI(Repetitive Strain Injuries). If you are a lefy, it will also make the convenience for you. ... Also you can change the mouse buttons in windows control pannel, but it takes you several steps to finish it, and it is impossible to flip the cursor. ... With the reason above, I maked this utility. ... Because it makes it possible that by simply press a hotkey, the mouse buttons will be changed, and even the cursor will also be flipped.
http://www.ambidexter-mouse.com/down/Ambidexter%20Mouse1.2.exe - 1Mb - Download - Screenshot