I just discovered this today, and thought I'd share it. Manybooks has an audiobooks section.

http://manybooks.net/categories/AUD

Nate: Thanks for the link. I have never been keen on audio books in the past, but things change so I'll give it a shot.

I've also downloaded a couple of audiobooks from Librivox -- http://librivox.org/ Another place where a few fanatical volunteers donate hundreds of hours.