You're looking for an ergonomic keyboard? Here's a gallery with many devices, some maybe just as “historical” information, but many with unusual designs.
BTW, Microsoft just announced the Natural Ergonomic Keyboard 4000 some days ago. As this has a correct layout after all the crippled ones before (but the original Natural Keyboard), this will replace my old Natural Keyboard (maybe I'll use the old one at work then).
