(Wall Street Journal) — Google Inc. launched Google eBooks, its long-anticipated digital bookselling enterprise, on Monday.  The venture, now rolling out across the Web with hundreds of thousands of popular titles for sale and millions more free, will compete for a slice of the digital books business, which is valued at close to $1 billion and is expected to grow in the coming years.  Google eBooks, formerly called Google Editions, represents another opportunity for the Web giant to go toe-to-toe with two of its powerful rivals, Apple Inc. and Amazon.com Inc., and to open up a new stream of revenue outside of online advertising.
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