As of today, Photographer’s Guide to the Canon PowerShot S100 is available for purchase as a downloadable file from Apple’s iBookstore for iPad, iPhone, and iPod Touch. The book has the same content as the other versions, which are available in paperback and for Kindle and Nook. To see the book’s information page, you can search for the book by part of its title in the iTunes Store, or you can use this link to the book’s information page in iTunes.