http://singularityhub.com/2011/07/15/pixars-ex-designer-creates-stunning-interactive-book-for-ipad-blurs-lines-between-reading-film-and-video-games/
Too late for my daughter but I hope my grandchildren will get to have the Diamond Age version.
If you have no idea what I'm talking about: http://en.wikipedia.org/wiki/Diamond_Age