January E-book Sales Soar, Top Hardcover, Mass Market Paperback

PW: "The surge of e-book buying expected to take place in January following a round of holiday e-reader gift-giving did in fact materialize. According to preliminary estimates from the Association of American Publishers, e-book sales from 16 reporting companies jumped 115.8%, to $69.9 million in January. No other trade segment posted a sales increase in the month."