If you are considering publishing your book for the iPhone or iPod you might be interested in the publishing service John, my husband, is offering on his website John E Donovan Mobile Solutions (discontinued).
“For people who would like to publish their fiction or non-fiction book on the iPhone/iPod we can provide the solution, reasonably priced and not restricted to free books.
If you would like to sell your own book on the iPhone/iPod we can provide the application framework to suit your needs.
For Book Publishers who would like to publish to the iPhone/iPod but are looking for a reasonably priced solution we have the answer for you. “
The service is available to individual authors as well as publishers.