Welcome to the LibriVox.org scripted service. Here you can search for, listen to and download ( copy to local collection ) free public domain auido books of out of copyright texts, read by voulenteers.

From the LibirVox.org site:
"LibriVox volunteers record chapters of books in the public domain and release the audio files back onto the net. Our goal is to make all public domain books available as free audio books. "