I have a friend that swears by Audible.com for audio books (he listens on his commute to and from work)...I stay at home so haven't really checked it out until TODAY. Right now when you head over to Amazon Local you can score a free $10 voucher to Audible.com. They have over 100,000 audio books to choose from. After you score your voucher from Amazon Local just head here to redeem it.
Look under Atlanta, Ga to find this deal.