Interesting One From The Rochester Democrat and Chronicle on Amazon. Author Mark Hare says Amazon is a great equalizer. Anybody can get any book with a few keystrokes. Making customers aware of it, of course, is up to the marketers. The No. 1 seller on Amazon, for many weeks now, is Harry Potter and the Half-Blood Prince, the sixth in J.K Rowling's series. It won't even be available until July.