I just now discovered the site, Recorded Books K-12, an educational blog for teachers. For the month of May, they are offering free downloads of the 1989 Newbery Medal Winner, Joyful Noise along with accompanying lesson plans. The lesson plans are designed to be used for a variety of age levels, making them ideal for classroom and home school teachers.
If you already use audiobooks as part of your curriculum or if you've always wanted to try them, you may want to consider downloading the materials. It looks as if the free materials are only available through May 31, 2008, so if you ARE considering it, it wouldn't hurt to download them and use them later.
I'll keep my eye out for more free literature-based resources!