Yesterday I finally got one: A Microsoft Natural Ergonomic Keyboard 4000. During a lunch run with Dennis to BestBuy, I broke down and bought one for work. You can buy it from Amazon for US$49.99.
This is a nice keyboard. If my computer at home did not have a keyboard built in to it (or if I actually used my desktop), I would buy one for there, too. I hope that a future version of IntelliType Pro allows the nipple to be reprogrammed. Then this would be the perfect keyboard.
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.