I've posted an an article on my website called Free Culture Advanced which I wrote for the last edition of the Free Software Foundation Members' Bulletin which went out several months ago. The bulletin is one of things you get when you become an associate member of the FSF.
The article makes the case for free culture and a freedom definition in terms that are directed to and I hope will resonate with folks from the free software community. I've posted versions of the article in HTML, PDF, and LaTeX.
