Ive been MIA for a little bit but I saw this board on engadget today and figured I would swing by to see what ppl had to say about it. Some interesting notes are that they are still using what looks like a nearly 3/4" thick deck, they have moved from Socal to Norcal (smart for startups), and they only sold a couple hundred z-board v1.0's. They are in the money at $899, but that should be the final price, not the early bird special.
Id really like to get my hands on one and see how it rides. I wonder what sort of error correction they have built into the controls: i.e. if you hit a bump with your front wheel, it forces the board up against your foot, temporarily creating additional pressure between your foot and the button. If its just a straight control, this would send a momentary pulse to the motor causing it to jerk.