The Clone Wars : Decide Your Destiny books are interesting, on one hand they're Star Wars books in which you can choose the path of the plot, like the old Fighting Fantasy series, but also they contain codes which unlock extra content online. The official press blurb says...
With dozens of destinies to choose from, these innovative books contain multiple stories that continue via URLs which allow you to jump in and out of cyberspace, accessing integrated online content such as games and Flash-animated sequences.
The trailer for the books is embedded below. I like the idea of integrating online content, especially for something like Star Wars which is clearly cross platform anyway. (Is book a platform?!)


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