I have been suffering with RSI for past 7-8 months now due to working at the computer. Anyways, only very recently I have found that trying to use my hands as little as possible (outside of work) is the totally wrong way to go about things in term of rehabillitation. The idea is to try and exercise my wrists, forearms etc and get some strength back into them. So i've been using light weights this past week to build up my wrist strength etc. I believe I have already found a slight improvment.
I have just ordered a powerball after stumbling across its supposed benefits and trawling through this forum so i'm very excited to see if it helps me with my condition. I will definitely update on my progress!