If you go to LibriVox.org, you can listen to free audio books recorded by volunteers. How is this legal? Here is a clip from their website to explain:
"LibriVox volunteers record chapters of books in the public domain and release the audio files back onto the net. Our goal is to make all public domain books available as free audio books. We are a totally volunteer, open source, free content, public domain project."
All of the books are easy to listen to. You can download audio files to iTunes or as mp3's. Or, if you like, you can stream directly from the site. A teacher can now assign students to listen to Romeo and Juliet on their iPod.
I learned about this site from an emagazine that I subscribe to called: "Learn Out Loud." This is a mega site for audio books, podcasts, mp3's and video that can be used for education. The content is a mixture of free and fee based. Personally, I have been checking out the technology and politics sections.