The Moon Bone Cycle is a 44-page fully-painted comic book (or graphic novel, if you prefer) loosely based on traditional aboriginal song-cycles.
myebook.com has a lovely user interface that even makes a noise when you turn the page. It requires Flash, by the looks of it, and requires a decent internet connection. Go and have a play - the first ten pages are available as a free preview.
I'm talking to other online ebook providers to find ways of making offline e-book solutions possible too.