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The new NOOKColor, apparently, is a particularly popular seller, as B&N says that it was the number-one selling gift of the holiday season.
Much like Amazon, Barnes & Noble is not actually reporting any specific numbers here, merely referring to "millions of NOOK eReading devices sold," but the announcement is still indicative of the growing popularity of e-readers and books. In fact, the company also reports that it now sells more digital books than physical on BN.com (which Amazon did last year).