I was listening to talk radio today and they were talking about books on tape from:
http://www.audible.com
You go to the site, click on the radio and put in "LARS" (local talk show host) as the password to get your free audio book.

I was surprised to find the audio book was Blackhawk Down.

I suggest you select the download and listen later option, rather than the streaming option.  You will need the Real Audio Player and the audible-plugin to listen to the audio book.