Looks like ePub if you're going to add re-flowing text (I see in the other thread what a pain that can be, but I think it works fine for Programming Python which I have through Google Books).
They also support PDF, which I'd still prefer to purchase through Google directly if only to keep my stuff in one place.
They also support PDF, which I'd still prefer to purchase through Google directly if only to keep my stuff in one place.
http://support.google.com/books/partner/bin/answer.py?hl=en&...
http://support.google.com/books/partner/bin/answer.py?hl=en&...