The Kensington Comfort Type USB Keyboard is a low cost ergnomic keyboard that I use. It has angled keys to force a comfortable, relaxed wrist position and light action for easy touch typing. It is easier to switching to than the other keyboard I use…

The Kinesis Advantage USB Keyboard is an ergnomic keyboard that I also use. It has a split design that keeps your wrists in a more natural straight out position, rather than twisted inwards. The Delete, Back space, return, Space keys are used often, so they are positioned so your more powerful thumb can hit it. It took me about a week to get used to it, but it is worth it.

Try to visit a store to test out more expensive keyboards. A lot of their ergonomics has to do with how far apart your hands are in a neutral position and how big your hands are.

I have these two keyboards and switch between them during the day.  This prevents my hands from getting stuck in one position for too long.

Here are two books that have helped me recover from Repetitive Strain Injury or RSI, which many people call Carpal Tunnel Syndrome:

Dr. Pascarelli’s Complete Guide to Repetitive Strain Injury: What You Need to Know About RSI and Carpal Tunnel Syndrome by Dr. Pascarelli

This is the bible on recovering from RSI. Recognizing the early signs and risk factors, Finding a doctor, Preventing RSI, recovering.

Conquering Carpal Tunnel Syndrome : And Other Repetitive Strain Injuries by Sharon J Butler

This book contains stretching exercises to gently relieve the tension in your body and to strengthen weak muscles. The exercises I employed are on page: 106, 110, 112, 116, 128, 130, 134.
I perform them every morning.