Amazon revolutionized the ebook market in 2007 when it released the kindle, an ebook that can download content from Sprint’s EVDO wireless network. Since then Amazon has release two new versions of the kindle, the kindle 2 and kindle DX. This week, Barnes and Noble entered the ebook market with their own device, unfortunately called the Nook. The device, like the kindle, allows users to download content wirelessly (from ATT’s network), but also features a few interesting extras, like a