A commuter (L) reads on a Kindle e-reader while riding the subway in Cambridge, Massachusetts March 18, 2011. Publishers are adapting to rising sales of e-books, and the popularity of smart phones and tablets such as the iPad. The retail landscape has changed with Amazon becoming the dominant seller of books while countless book stores go the way of video rental stores. America's No. 2 book store chain, Borders, is bankrupt. Some authors have dropped their publishers entirely, self-publishing online and using social media to connect with readers. Picture taken March 18, 2011.