I was looking at one of my favorite blogs, Books on the Knob, yesterday, and saw a link for this site http://www.audiobookcommunity.com/group/sync/forum/topics/sync-summer-2011
Each week they will have two free downloads, a classic and a YA pairing! This week (June 23-29) they are offering Shiver by Maggie Steifvater & Romeo & Juliet by William Shakespeare.
Here's the list of this summers offerings
You will have to install Overdrive to download them, but it is very easy, and I'm already listening to my free copy of Shiver!