Thanks for the link. I'm pretty much done with keyboards that hve the back row higher than the bottom row. Right now I'm using a diNovo (flattest keyboard I could find) with a pencil (hexagonal, so it doesn't roll) under the front edge. The only downside so far is that it's still a straight keyboard layout.
I like the idea of a changing position, though. But I take enough breaks from typing that I think it's more position and comfort at this point.
http://smartfishtechnologies.com/products-keyboard.php