Audiobook-download site Simply Audiobooks offers a selection of free public-domain titles.
The books include Mark Twain's The Stolen White Elephant, Jack London's Call of the Wild and Joel Benton's The Life of P.T. Barnum. There are 11 titles to choose from, all of them in WMA format (which leaves iPod users out, unless they convert the files to AAC or MP3). Cleverly, the books are all divided into 3-5 minute chunks, which makes for easier navigation on portable players that lack bookmarking capabilities.
Check it out @ simplyaudiobooks.com