Many of these eBook sales have come through Kindle. USA Today: "Amazon.com, the biggest player in the growing e-book market, told The Associated Press on Wednesday that Larsson's The Girl With the Dragon Tattoo, the first book in the Millennium trilogy, is the all-time top seller on the eBook reading device the Kindle. Kathryn Stockett's novel The Help is No. 2." Knopf has sold 500,000 eBook versions of The Girl With the Dragon Tattoo alone.Interestingly, Knopf backs up the Amazon numbers put out this week claiming that eBook sales have surpassed hardcovers. USA Today reports: "Kindle sales for the most recent Larsson book, The Girl Who Kicked the Hornet's Nest, have topped those for the hardcover."