U.S. e-book content revenue is expected to reach $3.19 billion by 2015

Is your book up on Kindle, iBook, Nook, and/or other digital formats? That's a whooping big number of sales that are expected in the next 3 years. Not to mention the number of sales that are happening right now.

Learn how you can get your book up on e-publishing platforms at DIY e-Publishing group.

Source: SmartMoney