I like this, and see pressure sensitive keyboards being predominant in the not too distant future, based primarily upon the supplemental embedded video at the bottom of the linked page. All of the proposed uses, from deleting word at a time, to recognising typos, to movement in games, I can't see any argument against. Its just a genuinely innovative device.
A lot of the competition entries are rather useless as they stand, but go a long way to show the potential of the platform. One problem I've always had with PC gaming is not being able to play driving games properly without a controller, as on/off left/right is useless. I suppose this would solve that problem, as I'd now have an analogue keyboard.
As to the typing/password recognition, of course it would have teething problems en route to full user acceptance, but all of the criticism levelled so far is easily surmountable. Someone loses a hand, or their typing changes - easy! As per online banking and whatnot, the user can answer a few predefined questions (independent of typing style) and reset the memory. A brute force attack could be prevented by limiting the number of attempts.
Okay, so a couple of problems would always be present, such as typing with a coffee in hand or logging in to your girlfriends facebook, but overall I am thrilled by the idea, enough to make my second /. post ever, and am very much looking forward to owning one, providing they don't come with optimus maximus pricetags.