This site is primarily about Lyme disease but I must share my experience with the DataHand Keyboard by http://www.datahand.com. This device has saved my career. It did not take long to learn how to use, but it has completely alleviated any keyboarding stress I had experienced with other so-called "ergonomic" keyboards. I recently learned the company is no longer making the keyboards so I purchased 3 of them used and am on a waiting list to get a new one. I can't imagine life without this tool.
If you have any questions about the keyboard feel free to contact me and I can try to help you.