Like Audiobooks? Looking for something new, and maybe even unpublished? Podiobooks is a site that offers free audiobook downloads of unpublished books in all genres. There's even a few that were written specifically for the YA crowd, so go take a look!
Also very cool is Librivox, which offers free audiobook downloads of books in the public domain. (Hint: Many of the books assigned in your English classes are in the public domain. Read the book, then download the audio!)