The health of my right hand would be much improved if I was doing my computing with the Run-chy Mouse. The Run-chy Mouse was designed by Jung-eun Park to help hardcore computer folks reduce the risk of RSIs.
How does the Run-chy Mouse help you avoid cramping up, or worse, Carpal Tunnel Syndrome, you ask? The Run-chy Mouse has a timer on its underside that controls when the mouse "runs away from your hands." If you decide to take a break from computing every hour but forget, the mouse will remember for you and automatically make a break for it.
I am loving nearly every aspect of the Run-chy Mouse, but I would like to see a cordless version of it. I'd rather my hand fall off than compute using a mouse tethered to a cord.