Research firm Yankee Group estimates that the U.S. e-book market will reach $2.7 billion in sales in 2013, up from just $313 million in 2009. That's good for a growth rate of 83 percent, above even paid mobile apps, at 72 percent.
Already, Amazon claims that Kindle e-books now outsell paperback books on Amazon.com. This is great news for…
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