Long story short: "Do not buy a single record. Do not download a single song, legally or illegally. Do not go to see a single film in cinemas, or download a copy. Do not buy a DVD in the stores. Do not buy a videogame. Do not buy a single book or magazine."
I remember some bloggers recommending it around the time the DMCA was introduced. (The idea being that MPAA/RIAA cannot make money from it but cannot ban it either.)