Item (from a short entry by Terry Hart on Copyhype.com):
The fact that evidence backs up one of the central premises of copyright law is, however, only a precursor to the real question: what, if anything, should be done to address the harm from online copyright infringement? The role of law in answering this question attracts perhaps the most heated debate. That leads to the next question: does copyright enforcement work?
Definitely worth reading the whole thing (and following its links) here.