I'm not much of a book reader myself, so I don't envision getting one for myself (although it could be a good gift for my wife). Actually, the thing I find most interesting about it is Amazon's "Whispernet" delivery network. It's build on top of Sprint's EVDO network, but I'm not sure what is different about it from what Sprint already has.
Of course, my first question is.... I wonder if they are planning on utilizing it to deliver music and movies to another Kindle-like device they may have in the works?