Lawrence Lessig's latest book, "Free Culture," on the topic of copyright, is available for download free of charge, for a limited time, at Amazon.com. It's a very interesting read, if you like that kind of thing. Lessig is the Standford Atty who argued before the US Supreme Court that the Sonny Bono Copyright Act is unconstitutional. He did not, in spite of what may have been the better argument, prevail. (Bono felt copyright is forever).