>> Don't use a 'moving mouse'. Apple magic trackpad is great. Trackballs are great as well.

I have used Apple Magic trackpad for almost an year and I started having severe discomfort when I my middle and ring finger are stretched. I was not resting my palm properly and that probably contributed to the issue. I switched to an evoluent mouse (http://www.amazon.com/Evoluent-VerticalMouse-Regular-Right-V...) and it got better very fast (in couple of weeks).