First of all, what is an Epub? An Epub is a digital version of a book that is designed to be read online using free applications like Adobe Digital Editions and Calibre, or on a number of eBook readers such as the Sony Reader and Barnes & Noble Nook. You can even download applications that will allow you to read eBooks on your iPhone and iPod touch. The Epub format can also be easily converted to Mobi, which is the format read by the Amazon Kindle. You can easily do this conversion yourself using Amazon's Kindle Previewer software. Check out www.adobe.com/products/digitaleditions/devices for a complete list of devices capable of reading Epubs.