Nick & Norah's Infinite Playlist (yes, it was a book before they made the movie). It's a very different story, and at times I'm uncomfortable reading it. There seems to be a lot of animosity revolving around "how Jewish" Norah's ex-boyfriend was, and it's not like they just happen to make him Jewish and just happen to make him an asshole; in the book, the things that Norah hates so much about him have a lot to do with how Jewish he is. Other than that, it's interesting. I definitely prefer the movie though; the authors also have a strange perception of the teenage thought process.