Devices like the Sony Reader, Cybook, and Kindle DO NOT have glowing LCD screens.
Typically ebook readers are larger than PMP's with larger screens. If you're going to read for a few hours, then the screen of a typical PMP becomes pretty eye-straining (due to size, contrast, and brightness).
Amazon can do a lot of money only from selling kindle, like Apple does with the iPod.
Non DRM Mobipocket format is already supported on the Kindle - just drag and drop.
A revolutionary portable reader that wirelessly downloads books, newspapers, magazines and blogs to a crisp, high-resolution electronic paper display that looks and reads like real paper, even in bright sunlight.