I know I'm probably discovering this technology a couple of years after the rest of the universe but this kind of thing really appeals to my inner-geek-goddess (!).
Okay so is this kind of technology only suited to textbooks or other non-fiction? Am I crazy to imagine the kind of fun you could have with this in a fantasy novel, a sci-fi adventure, a ghost story - ghosts drifting across the page, 3D models of space-ships, interactive maps of the world your characters inhabit, snarling werewolves, mood-music at the beginning of every chapter (tried to do that for one of my beta readers but couldn't get it to work *sigh*).
What do you think?