On Copylefting Your Text?

eclectric asks: "This subject has been mentioned in passing in a few slashdot comments in recent weeks, but I for one would like to find more information on the subject of copylefting text. I've seen some licenses, including the GNU Free Documentation License and the Open Content License, but both of them seem limited to software documentation and academic papers, respectively. Is one of these the path to take, or does the creative world need a new 'copyleft' to combat the forces of evil, namely the DMCA. What kind of steps have other authors taken, including just putting their works in the public domain, to insure that their works remain free of the limitations of US and International copyright law."