Also, you can't buy books from the Apple store. They and B&N chose to go with a slightly different encryption method. All of the other stores selling ePub format will work on the Sonys. Visit
www.inkmesh.com and
www.feedbooks.com to comparison shop for titles or authors. They search several different bookstores, so you can compare prices. Just be aware that Sony only lets you purchase using the clunky Sony software.