Not really sure about this. Do people read, or skim on devices like this? I have looked at the publishing requirements, and it is very demanding as the formating is completely different to hard text for a printed book. Normally .pdf is the prefered format for printing. But with e-books, each reader (device) formats the text to suit the display. So it needs to be a very open text format that can be manipulated by the device to suit the size, resolution and format of the screen. In other words, each device will change the way teh book is formatted. So they will not accept chapter or index page numbers for example. Also difficult to format footnotes and references. So, when is a book, a book?