The main cause of carpal tunnel is repetitive movements, such as using a computer mouse.
Graphics tablets have now become an affordable and attractive way to vary how we interact with the computer. Instead of using a mouse, with a tablet you use a pen or fingers for the same purpose. Most people who get started with a tablet say they will never go back to using a mouse.
A good graphics tablet which allows both pen and finger input is the Wacom Bamboo Capture Pen Tablet (CTH470), although there are many others on the market.
In the future, there will likely be even more variety. There is already now experimental systems (using Kinect) which allows the user to use their whole body to interact with the computer, and this may be another tool in our interface toolbox in the not-so far future.
Per K-L (guest writer)