SOPA is awful public policy. For one, it does nothing to actually combat online piracy. By creating a DNS blacklist they have done nothing to remove the offending servers off the net they just made it slightly more inconvenient for anyone with half of a brain. It doesn't take much to bookmark an IP address instead of a web address. I could envision websites that exist solely to provide IP addresses to bit torrent trackers springing up faster than the overlords at the RIAA pulling them down.
More frighteningly, it furthers the precedent that the US government can own the internet and sell it out to the richest interest groups in America.
The funny thing about the 'war on x' (insert: crime, drugs, poverty, etc..) is that the laws and reality are often so far detached. Even politicians know this. I know many people whose job it is to write laws on both sides of the aisle, and they all know the issues forwards and backwards. However, once you get out of the academic realm in which staffers live and enter the realm of political theater, many Members think that they have to sound tough on these issues to our largely apathetic public so come election day they can say, "Hey, America, I voted to stop online piracy and make the internet safe!" Even when they all know that the reality of the legislation does nothing to solve the problem.
This will be misused immediately when recording companies start asking for injunctions for valid sites that cut into their market share.
Wow, I never noticed that before. Piracy will never be stopped. It will be a part of the internet, just like crime is part of life. There's no changing that.