Coming in April......Audiobook Sync.... more news to follow soon.
LibriVox (http://librivox.org): LibriVox’s objective is “to make all books in the public domain available, for free, in audio format on the internet.” Books are read by human voices (you can volunteer to read!) and can be listened to through your browser, downloaded to your iPods or other mobile device, or burned onto a CD. LibriVox is a non-commercial, non-profit and ad-free project.
Open Culture (http://www.openculture.com/freeaudiobooks): Download hundreds of free audio books, mostly classics, to your MP3 player or computer. You’ll find great works of fiction, poetry and non-fiction, by such authors as Twain, Tolstoy, Hemingway, Orwell, Vonnegut, Nietzsche, Austen, Shakespeare, Asimov, HG Wells & more.