LibriVox volunteers record chapters of books in the public domain, and then we release the audio files back onto the net (podcast and catalog). Our objective is to make all books in the public domain available, for free, in audio format on the internet. We are a totally volunteer, open source, free content, public domain project.
An initiative that intents to publish free audiobooks on the web.
The list of available audiobooks might not be large right now, but the project looks promising.