I have used a Contour Mouse daily for over ten years, without it failing me once. It is the old model with a ball, and has a converter from RS-232 to PS/2. They are a bit pricey, but you can get them in different sizes; mine is "Large" and designed for left hand operation. The keys are mirrored in hardware so you don't even need to talk with /dev/mousectl for swapping buttons ;-)
For what ergonomics is worth, I love the larger design that lets your whole palm rest on the mouse. /jonas Stuart Morrow wrote:
Perfit mouse. I've never used one or anything, but it's what the thread asks for. http://www.contourdesign.com/ stuart
