The "Stop Online Piracy Act" (SOPA) amounts to control of the INTERNET by the US Government. Granted, there is a lot of piracy taking place, but the usual problem solving approach by the government ("punish everyone to control a small group of miscreants") is something to be avoided here, as the SOPA is way over the line.
Dan Collins of the Conservative Commune offers good analysis of this legislation, currently being fought by Congressman Daryl Issa (R-CA), with the advice to contact your Federal Representatives about this bill.
UPDATE:
Hot Air offers some more thoughts on the matter.....and the bill is coming up for a vote in Congress this week. Contact your Congressional Delegation about your concerns (links are in the side bar).