Wireless Week: "Sales of Barnes & Noble's Nook eReader have been higher than expected, helping the company's market share in digital books exceed its share of physical books just one year after it entered the eBook arena, the company said in its earnings today. 'Since launch, sales of Nook have been nothing short of spectacular and consistently above plan,' Barnes & Noble said in its earnings, adding that eBook sales are 'accelerating week-over-week.'"