I recently came across the Chronicles of Narnia podcast. Listening to audiobooks is a win-win for anyone involved: It can help pass the time on road trips, struggling readers can listen to the words as they follow along with the printed text, younger children can hear the book even before they can read it independently. At one school where I taught, students were able to check out iPods (with parent permission) in order to listen to audiobooks like this one. While not all schools are able to offer iPods, I think that offering this kind of a service (even just at school) is valuable. Finding the mp3 files for free is a bonus, too!
How have you/could you use audio books in your classroom?