"A mouse with a controll pad built into it (maybe by the thumb) so you can move your body and your head all with just one mouse. No need for the keyboard. Whacha think?"
Think that you don't want to require thumb dexterity on a controller that you are moving around the desk. On the other hand, I think it would awesome if they made on of those Nosotromo Speedpads with PS2-like analog joystick on the side instead of the current, difficult to use joypad.
I'm still waiting for someone to develop eye-tracking controllers that see where you are looking at and move your view or cursor accordingly. That will rock.
P.S. I could never get my Space Orb to work well on anything except Descent, for which it is still the best controller EVAR!...hmmm...think I'll reinstall that one tommorrow.