Amazon has gained so much market power by selling books on the Internet that it's being accused of abuses, including blackmail and censorship. The popular retailer is now listing certain books and authors as "unavailable" -- including the paperback edition of Brad Stone's The Everything Store: Jeff Bezos and the Age of Amazon. Some publishers accuse Amazon of delaying shipments and raising prices. Titles published by Hachette, including Scott Turow, Malcolm Gladwell and J.D. Salinger may take weeks before they're shipped to customers who order them on line. David Streitfeld, technology reporter for the New York Times, has more on how publishers and authors are fighting back.