EFF's page on the issue is here https://www.eff.org/deeplinks/2011/11/stop-online-piracy-act-blacklist-any-other-name-still-blacklist .
If you read up on this and want to oppose it, I encourage you to go straight to the contact pages at your House member's and Senators' web sites and type a personal letter. That shows a stronger sentiment than a petition signature or message pushed via an interest group. The MPAA and RIAA are out of control, and it's sad to see that a 'new economy' outfit like Netflix is on board with this egregious effort to create a back door path to blacklists.