Amazing enough, despite the fact that John Piper has written over 30 books, until now none of them have been turned into audio books. But now Hovel Audio, with the narration of Grover Gardner, has produced an audio book for Desiring God: Meditations of a Christian Hedonist. (Running time is 12 hrs., 20 min.) You can listen to a three minute sample, and/or purchase it through the Desiring God store.