I have to jump on the Maltron bandwagon here.
We do sell them - but mainly they sell themselves. They have a great reputation amongst those who know more about ergonomics than I do (I have no medical training). Most of the sales we make are when they have been 'prescribed' to typists whose careers are threatened, sometimes already off sick with RSI related issues, and have sought expert advice.
The proof of the pudding is in the eating and we never get them back. People want to keep them because they fix their problem, and they don't break down. Maltron service them 100% so it is a keyboard for life.
The E Type was the first and is still, to my mind, the best ergonomic keyboard. All others are pale imitations. (Pretty nice car too).
The man designed them in his shed, and then manufactured them there. He compromised very little on ergonomics. That's why it looks wierd and is so expensive. I think the biggest problem was to mount the keys on the curve as it is. There is a hand soldered mesh of copper wires underneath joining all those Cherry MX switches up, and this could not be automated.
There is a trackball model too.
http://www.keyboardco.com/keyboard_details.asp?PRODUCT=24I agree that mice are the growing problem nowadays.
People have a number of factors in mind when choosing keyboards but if it is 100% ergonomics, for use at a desk, Maltron take some beating.
Before buying I would recomend a good root around on
http://www.maltron.com/index.htmlThere is a wealth of info on there - well beyond my knowledge.