That's fascinating from an engineering viewpoint, Dan, but it is for the thumbmeisters. For my purposes (editing a novel, sending in a substantial report from a field beside a murmuring stream — here's hoping!) your rollup keyboard is actually superior to this impressive technical solution to... what? After all, Blackberries have physical buttons operated by thumbs already. I thought that in the video they made a mistake putting the woman demonstrating their bumpyboard next to a guy obviously doing real work on a laptop not all that much bigger than their device.
When I really put my mind to it, between my iPad and the very capable and lightweight fullsize Apple Wireless Keyboard, when I'm on my bicycle the problem is solved, perhaps not elegantly (which is why I'm still looking)*, but definitively. It's the other case, when I'm on foot, with my iphone in my pocket, and wanting to send a long message or doing something intricate, that we're looking for a better solution than your foldup keyboard. The device above, no matter how ingenious, is a retrograde step.
Thumb operation is precisely what we're trying to avoid. Therefore, thumbs down, from me anyway. But thank you for introcuding me to a product I didn't know about.
*I have a commercially made leather case to take a bare iPad. It came with Bluetooth keyboard with moving keys and a palmrest on it's own leather cover, and it fixes into the main case by magnets. Elegant and convenient, if only it worked. But the keyboard is, for me anyway, crippled by being scaled down to the width of the iPad, so that it isn't full-size for touch typists. There is a certain minimum level of key spacing (probably 19mm ctc) below which a keyboard isn't fullsize except in Lilliput; all those clamshell keyboards for the iPad and other tablets suffer from the same shortfall. It's ironic that in my normal-use state the iPad in it's bulky Griffin Survivor case is precisely the length of Apple's Bluetooth keyboard, which is full-size and definitely a superior keyboard but far too large to take when on foot. That is why I was so keen on the laser projection of a virtual keyboard which held out the lure of a doing useful work with the iPhone as a screen.