Wi-Fi-enabled versions of the iPad will be available in March. Five of the six major American publishing companies have agreed to deals that will provide Apple's new iBooks store with content. Courtesy of Apple hide caption

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Steve Jobs unveiled the iPhone during his keynote address at the MacWorld conference on Jan. 9, 2007. Paul Sakuma/AP hide caption

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Amazon CEO Jeff Bezos holds a Kindle e-book reader. The Kindle leads the market in sales of electronic readers. Ben Margot/AP hide caption

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The National Book Award Winners for 2009 include (from left) Phillip Hoose (young people's literature); T.J. Stiles (nonfiction); Colum McCann (fiction); and Keith Waldrop (poetry). Associated Press hide caption

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