For those of you out of Kindle range or whatever, paperbackswap.com works great. You pay the postage to mail a book, that is your total cost. It works on a credit-debit system based on books you send and receive.
The discussion has veered into amazon.com, which I guess is natural since they are the Kindle seller. I think it's an amazing and innovative company, really a big help for rural folks when it comes to purchasing all sorts of things.
I do see some parallels between the early IBM mainframe or Microsoft PC days and, amazon and google. Both of them are trying to corner and hold a market segment. They are both leaving the gee whiz stage and people are taking a closer look at them and their policies.
Dave.