PC Review has an article outlining some useful tips to help you avoid RSI whilst using your PC.
Repetitive strain injury can cause serious problems, which are more difficult to cure than to prevent in the first place. There are various types of RSI affecting different parts of the body, Carpal tunnel syndrome, Bursitis, and Rotator cuff syndrome are some typical examples, but there are many more. If you spend a long time sat at a desk or on a computer it is highly recommended that you take into consideration the potential problems of RSI, and take steps to prevent or combat it. If after reading this you think you could be suffering from symptoms of RSI, see your Doctor.How to avoid RSI from computers