Unlike most other audiobook webstores, Unabridgedbooks (http://www.unabridgedbooks.com/) provides their audiobooks without any copy protection schemes. The books and stories are from the public domain, though read by professional narrators. Of most works you can download the first chapter free of charge.

[via BoingBoing (http://www.boingboing.net/2006/01/23/drmfree_mp3_audioboo.html)]

Of most works you can download the first chapter free of charge.
Nice feat... take the first chapter with you in the car, read the rest at home on your PDA - all for free ;)