According to Amazon CEO Jeff Bezos, Amazon now sells more Kindle books than hardcover books in its online store. Over the past three months, for every 100 traditional books sold, Amazon has sold 143 Kindle books. And in the past month alone, for each 100 books sold, Amazon has sold 180 Kindle editions. These numbers exclude free Kindle books, but if they were included, the figures would be even higher.

While Amazon has been around for 15 years, the Kindle and Kindle store have existed for just under three. Amazon credits the success to lower prices for the ebooks (many, even new releases sell for just $10), and the availability of out-of-print books in the Kindle store. Additionally, the recent price drop and wider availability of the device and a number of mobile apps have made the store a popular entertainment destination. Are you on the Kindle train? Tell us how many books you download on a regular basis in the comments!