I like this idea. I have a great old Douglas Adams one on tape which I used to love listening to in the car when travelling heaps of distance. So I am slightly used to "reading" a book in an unconvential manner.
The audtio books should be great for me - the radio is no good during the week anymore (finally getting too old for triple J, but too young for Nova and I hate commercials!!) so this would be a great time to "read" a book (something I haven't had time to do for ages).
Whilst I love the "feel" of a book, imagine the environmental saving in paper, manufacture, delivery and storage.