Lawrence Lessig, a professor of law at Stanford, is a strong advocate for preserving the public domain, in the sense of a Commons of culture. He recently published his third book, Free Culture, to discuss this topic. Putting his money where his mouth is, he has placed the book under the Creative Commons license, allowing others to put the book online, place their own creative spin on it, and otherwise surprise him.
So I was interested to hear in the cooperative project to create a "Free Culture" audiobook. Volunteers from all over have each recorded a chapter of the book read aloud, and they are now all collected together at the above link. The quality is very uneven, but certainly listenable. I am working through them now using my iPod. It's pretty damn neat!