Bumping this thread because I'd also like some recommendations. I currently use the standard Apple keyboard (the older, white one.. not the new thin ones) and find more and more that I think an ergonomic keyboard would be much more handy to put less strain my hands/wrists
The main two I've looked at are the Microsoft Natural Ergonomic Keyboard 4000 and the Logitech Wave. I can't decide which I like better, though. On the one hand, the Microsoft keyboard has a higher arch due to the split keyboard, but the Logitech is still one clean connected set of keys.
I saw the Microsoft one on display in Best Buy and it was attached to something that raised the front part of the keyboard (where your wrists are) up off the table a bit, which I think I would like. Does the Logitech one have anything similar?