http://www.booksurfers.co.uk/# – A series of four books (more to come) that follow a group of four kids as they delve into literature — literally. As they “travel” through four classic children’s books. The text links to the original children’s book text.
In an article from Mind/Shift, Audrey Watters (follow her on Twitter @audreywatters) argues for what many of us already use in the classroom — graphic novels. There are graphic novels available in eBook form.
Another article by Audrey Watters shows more animated eBooks.