Hi! Received this link in my mail today. It has tons of free books and some are audible as well.
http://etc.usf.edu/lit2go/
From the email:
Lit2Go — a collaboration between the Florida Department of Education and the University of South Florida College of Education — supports literacy by providing access to recordings of historically and culturally significant literature. The extensive collection of hundreds of audiobooks, stories, and poems, including classics such as Alice in Wonderland, Aesop's Fables, and A Tale of Two Cities — all for free on iTunes.