I have created two free multi-touch books that are available on Apple’s iBookstore (each cover is linked to the iBookstore page for the book):

Cover: Zoom In
Cover: Handsfree

As part of my advocacy work, I edited and published a collaborative e-book  focusing on digital storytelling as a tool for disrupting perceptions of disability. This e-book, I Am More Powerful Than You Think,  and the campaign behind it was featured on the Book Creator developer blog.