This seems kind of interesting: the whole surface of the keyboard is a flat touchpad, basically, so there are all kinds of gesture-based macros. E.g., you hold down "shift" by pressing with 4 fingers of either hand, so you don't have to actually reach for the shift key. And you can do things like "increase font size" in your browser by pressing and spreading your fingers. So it's like a combination of of Palm Graffiti and a keyboard. And you don't have to move your fingers off the "keys" to move the mouse.
I can't imagine trying to touch-type on it, though, without any tactile response: it seems like you'd be positioned on the wrong keys all the time, with no key-edges to feel.
Brad just gone one, and he likes it.
I'm still pretty happy with my chair-mount Kinesis Evolution keyboard; it's around four years old now, and starting to show it, but it's held up longer than most keyboards I've used, I suppose. I still wish it had a trackpoint instead of a trackpad, though (I use a normal desktop mouse with it, since I dislike trackpads so much.)