Lessig' gave a talk about remix culture back in March at TED: How Creativity is Being Strangled by the Law. His talk was just posted this month. For anyone who has seen him give a talk in the last 1 - 2 years, this won't be new, but it's very streamlined and very succinct. The video only runs about 18 minutes and it's excellent -- watch this!
Lessig emphasizes the importance of competition, that "more free" can compete with "less free," that artists' choice (to distribute differently, for example, to make their own works more freely available) is the key to defeating monopoly, and that laws that criminalize our children's creativity are corrosive -- and we can do better.
I have been developing an argument that touches on these same themes at Mass digitization ~ changing copyright law and policy, and in fact I had just posted this new segment last weekend that talks about how the sheer availability of so much good free content online inevitably puts pressure on even Hollywood and the music industries to stop making it hard for people to get to their content (DRM and subscription barriers, among others). Check it out.