Ebook sales are tearing up the publishing world like Ghengis Khan's last leisurely ride through China a few years back.  And interestingly, with each month's posting of total ebook sales, the increase in sales over the previous month's reporting rises almost exponentially (check out below). http://www.publishersweekly.com/pw/by-topic/digital/retailing/article/46870-e-book-sales-explode-in-februar…