In this internet, want-it-now age, what are some unique book matter ideas that you can pitch to an agent or editor to create add' interest in your book (besides the age-old inclusion of a CD or DDV on the back flap)? I am planning a book that will appear to a pop culture audience and am looking for ideas. Whether it be an addition to the book content or otherwise. (Ex: Magician David Blayne wrote a book a couple years ago that included clues to lead the reader to a reward.)