For book publishers, Christmas will come twice this year. After the festive trade in hardback tomes, the celebrations will begin again on Boxing Day, as the millions who got Kindles from Santa go online to stock them with reading material.Amazon already sells more ebooks than paperbacks. It claims sales of Kindle devices have reached 1m a week, while 13m iPads will find a home this quarter. Juniper Research forecasts 25m e-readers sales globally this year, and 55.2m tablet sales.
http://www.guardian.co.uk/books/2011/dec/18/ebook-price-wars