Okay, my techy clowder-mates.
I need an ergonomic keyboard that is compatible with Mac 10.8.
All the Microsoft ones are compatible with 10.4-10.6 or 10.4-10.7
Logitech's Mac compatible ones aren't ergonomic.
Grrrrrr.
Looks like I'm the only other Mac user in the Clowder.
I believe that all keyboards will work under OSX but the extra keys on the keyboard(ie. media keys, etc.) outside of the "F" keys won't work without drivers. So the requirements for the OS are just for the drivers so that you can use those extra keys.
That said there are work arounds that you can use. But if you don't care about the extra keys you don't need to do anything but plug in and setup. You can also switch the Cntrl, Cmnd, and Option keys around if they are setup different than you are used to. This is just done though the System Preferences> Keyboard> Modifier Keys
This has at least been my experience and understanding. My gaming keyboard isn't supposed to work on a mac at all but it works fine. I just can't use the extra Macro keys that are on the side.