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Tablet Wars 2011: Amazon, B&N to Tackle iPad, Each Other

The Apple iPad tablet isn't even two years old, but it owns almost three-fourths of the global market for tablet computers. HP's TouchPad couldn't take it down. That product lasted just two months before a $99 fire sale brought buyers rushing in for the discontinued product. But now it appears there are two serious threats to the iPad's runaway success: new tablets forthcoming from Amazon and Barnes & Noble.