I think Ergonomic Keyboards are the cat’s wrists. (In this case, that means they are a good peripheral.) I wish the Microsoft Natural 4000 keyboard had a simple USB hub, like the Microsoft Natural Elite did. Having a low-power USB hub in a large USB peripheral is a great idea.
Speaking of ergonomic devices, I did not have any trouble nor did I have any transition time to get used to my vertical mouse last year. It continues to work great. It can get jumpy sometimes, so on those occasions I get punished, but for the price, it is great.
If my MS Natural 4000 keyboard had a low-powered USB hub, I’d chain my vertical mouse on it.