LibriVox is another free audiobooks site which looks quite nice. You can also volunteer to read some public domain works into the library for them. It’s very Open Source, very community. Deserves to get an audience, so do take a look.
LibriVox volunteers record chapters of books in the public domain and release the audio files back onto the net (via podcast and catalog). Our goal is to make all public domain books available as free audio books. We are a totally volunteer, open source, free content, public domain project.