It's a sad thing to be an author and admit you lack imagination. But I guess I have to since people are creating amazing blurrings of book and video and who-knew-you-could-do-that which I simply couldn't have imagined before they became reality. I guess by the time I get around to buying an iPad, vooks will be old news and early adopters will have moved on to something even more incredible.
Imagine the day when a computer can look at my novel and treat it as a script, generating exactly-human animations that turn the novel into a movie, and with the added functionality that the reader/viewer can alter how the characters look with a few clicks of the keyboard.
Books = interactive media.