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Amazon.com

(AMZN)

was down 7.3% by late morning. As the online retailer unveiled another sales channel Wednesday, an influential

Robertson Stephens

analyst said the company risked overexpansion. Then today interactive television software maker

OpenTV

said its filing with the

U.S. Patent Office

could restrict Amazon's rights to "one-click" technology. Another online bookseller,

Barnes&Noble.com

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, was up 3.6%.