Nothing passes the time like a good audiobook.  The only problem is that buying audiobooks from sources like Audible or iTunes is often pretty expensive.  However, the quality of these paid audiobooks is always top notch.  Most free audiobook sites only offer books that are in the public domain (i.e. old), so a good source of free audible books is always welcome. 

SimplyAudioBooks is currently offering 11 free audiobook downloads by professional readers in split WMA tracks (conversion required for iPods):

• The Stolen White Elephant by Mark Twain
• Quotations of Mahatma Gandhi Narrated by Michael Scott
• Art of War by Sun Tzu
• Madonna of the Future by Henry James
• The Life of P.T. Barnum by Joel Benton
• Call of the Wild by Jack London
• The Camel’s Back by F. Scott Fitzgerald
• Greek Myths by James Baldwin
• Missions of California by James Baldwin
• The Waste Land by T.S. Eliot
• Metamorphosis by Franz Kafka

If you want a larger selection of free audiobooks that are a bit less “professional,” check out LibriVox.  LibriVox volunteers record books that are in the public domain and releases them on the site.  Your experience will likely vary from book to book.