I can't stress enough as to how important the ergonomics of our computers are on our body health and wellbeing. I have a desktop computer downstairs which gives me a sore back, shoulder and wrist within about half an hour of working there. I can't change the chair height and the spot where my mouse is seems to be an odd place for the comfort of my arm...ergo, pain. Right now I'm working on my laptop and have one of those little buttons in the middle of the keyboard instead of a mouse and I can work here for 6 to 8 hours without even thinking about my back or arm.
My next door neighbor just came back from the doctor because her wrist and hand were very tender and she found she was unable to lift anything heavy at all. She thought she was getting carpal tunnel syndrome and the doctor said it was tendinitis and that she should take anti-infammatories and painkillers (typical doctor.) My friend decided to wear a wrist guard and be very careful not to work too long at a time on the computer without doing a few wrist and arm exercises. I think she's got the right idea...but she should be trying to adjust the height of her worktable or chair, even if she uses a pillow (since she works part time, is new there, and doesn't think her boss will purchase an expensive ergonomic chair.
I'll check out the websites you mention. And I might even write an article on the subject on my website (which happens to be at http://www.bellaonline.com/Site/alternativemedicine/
Let me know how you've decided to deal with the problem.