... I *really* hope that this is finally the device I've been holding out for. I have hundreds of papers in PDF format, most produced using LaTeX, downloaded from the arXiv or elsewhere -- but because it's too much of a pain to read on-screen, I end up printing out several papers a week (dozens or hundreds of pages) just to read and then throw away. Stacks of printouts are gathering chalk dust on my desk, because I need to refer to them frequently, and don't want to print out a fresh copy every time I want to do that. People who complain that this device doesn't have a full-color touchscreen with video capabilities are missing the point: this is meant to replace your printer, not your computer.
Also, while I'm not a fan of DRM, it still beats the heck out of the "edition wars" in textbook publishing. Because used book sales hurt the market for new books, publishers charge an extortionate amount of money for new textbooks and constantly release new editions (sometimes with trivial changes, like rearranged exercises) to depreciate the value of used books. All else being equal, I'd rather see $40 electronic textbooks that can't be sold back, rather than $200 hardcover monstrosities that get "revised" every other year. (Of course, while this may be the lesser evil, it's still an evil -- I'd much rather assign a book that's freely available, or available in a cheap Dover paperback edition, than do either of these -- so don't flame me, please!)