This organization has been around for a couple of years, but just this month got a writeup in the October issue of Wired.
At the site you can find links to media that are either public domain or that are available for non-commercial use - or in some cases limited commercial use. You can also publish your own work with different levels of permissions."Some Rights Reserved": Building a Layer of Reasonable Copyright
Too often the debate over creative control tends to the extremes. At one pole is a vision of total control — a world in which every last use of a work is regulated and in which "all rights reserved" (and then some) is the norm. At the other end is a vision of anarchy — a world in which creators enjoy a wide range of freedom but are left vulnerable to exploitation. Balance, compromise, and moderation — once the driving forces of a copyright system that valued innovation and protection equally — have become endangered species.
Creative Commons is working to revive them. We use private rights to create public goods: creative works set free for certain uses. Like the free software and open-source movements, our ends are cooperative and community-minded, but our means are voluntary and libertarian. We work to offer creators a best-of-both-worlds way to protect their works while encouraging certain uses of them — to declare "some rights reserved."
Thus, a single goal unites Creative Commons' current and future projects: to build a layer of reasonable, flexible copyright in the face of increasingly restrictive default rules.
The October issue of Wired magazine includes a CD with 16 songs that have been put in the public domain (with or without limits) by their artists (track list).
