Interesting and thought provoking publication by Edward Lee on user-generated content/Web 2.0 tools and implications for copyright. As noted in the abstract:

“The most significant copyright development of the twenty first century has not arisen through any law enacted by Congress or opinion rendered by the Supreme Court. Instead, it has come from the unorganized, informal practices of various, unrelated users of copyrighted works, many of whom probably know next to nothing about copyright law. In order to comprehend this paradox, one must look at what is popularly known as “Web 2.0,” and the growth of user-generated content in blogs, wikis, podcasts, “mashup” videos, and social networking sites like Facebook and MySpace. Although users often create new works of their own, sometimes the works are “remixed” with copyrighted content of others.”

To read the entire abstract and the publication:  Warming Up to User-Generated Content.