Let the hive mind of Engadget get that for you.
"I love my little computing companion but I often find myself missing a full sized keyboard. I have been looking at several of these portable and flexible keyboards, but I can't seem to make up my mind about which I should buy. I don't want the keyboard to be overly expensive, but I want it to be good quality. Also, how difficult is it to type on these keyboards? Thanks!"
That might be an idea that got stolen but it could just as easily be an idea that both companies (and probably other people) had independently, before B and N saw the Spring Design prototype.
Nook looks really good and I hope that legal restrictions from either party don't impair the chances of other touchscreen-plus-eink readers. Ideally, readers probably wouldn't need a separate touchscreen, but at the moment a small display seems like a nice compromise (and a lot better than a keyboard).