Comment 1 for bug 1103679

Google Play could be possible because they accept PDF format files.

iBookstore accepts only EPUB files and Multi-Touch books.

We are already on Amazon as a printed paper edition. Making the Manual available on Kindle could be more tricky. See below.
http://www.amazon.co.uk/Getting-Started-Ubuntu-12-10-Manual/dp/1481265121/ref=sr_1_1?s=books&ie=UTF8&qid=1365206967&sr=1-1&keywords=ubuntu+manual

At the moment we are limited to pdf format files. Until the manual can be generated in either epub or mobi format we cannot add the file to Kindle or iBookstore.

We will look into Google Play.