Amazon just fired off another salvo in the e-book war, one that’s going to be very difficult to return: Selected e-books are available for free or at a substantial discount if you bought the print book new from Amazon at any time, dating back to 1995.
Of course, being an e-commerce site, Amazon has the data to do that. Barnes & Noble doesn’t, necessarily. Their records of in-store purchases will be spotty, at the very least.
It’s a fair and reasonable deal for consumers, and I think it’s a good deal for authors and publishers too.