1.Podiobooks (www.podiobooks.com) offers free audio books. You can subscribe with iTunes or any other podcaster.
2.Well Told Tales (www.welltoldtales.com) is a site containing free short story podcasts, which are shorter form of audio books.
3.LibriVox at www.librivox.org provides free audio books from the public domain.
4.At http://freeclassicaudiobooks.com/ you will find many classic books narrated by human voice for free. Also available in iPod format.
5.At Free Books www.free-books.org you will find thousands of free audio books in mp3 format.
6.At www.bookshouldbefree.com you will find lots of free audio books categorized from war to anthropology.
7.At AudioBooksForFree.com you will find hundreds of free audio books, all neatly categorized.
8.Talking Book Store has put together collection of 36 free audio books. You are free to download as many titles as you want. Download at: www.talking-book-store.com
9.At Open Culture (www.openculture.com/2006/10/audio_book_podc.html) you can download hundreds of free audio books, mostly classics, to your mp3 player or computer. You’ll find great works of fiction, non-fiction and poetry.
10.At Project Gutenberg (www.projectgutenberg.org) you will also find lots of free audio books, as well as free e-books.