This is old news but worth repeating for some ... In 2010, according to the Association of American Publishers (AAP), e-book sales represented around 9% of trade book sales. While the e-book format is incredibly important in today's publishing world, keep in mind that print format is still very much alive, especially adult paperbacks which rose 4.1% in 2010. Also, downloaded audiobook sales increased by almost 5%. Just another reason why you should publish your book in as many formats as possible!
Do you have a book you'd like to publish in multiple formats? I encourage you to visit www.mindstirmedia.com, home to the self-publishing company I own. MindStir can help you publish your book as a paperback, e-book, and downloadable audiobook.