The Amazon.com Inc. Kindle Paperwhite e-book reader is displayed for a photograph in San Francisco, California, U.S., on Wednesday, Oct. 3, 2012. Within its humble category, which features a six-inch monochrome E Ink screen rather than vivid color displays used in costlier tablets like the Fire HD and iPad, the Paperwhite lays fair claim to the title of best-in-class. Photographer: David Paul Morris/Bloomberg via Getty Images