As I'm sure many of you have heard, there are bills being proposed in Congress to change the Internet as we know it. Web sites will be regulated to ensure that copyrighted material isn't being transmitted, to the point where a web site can be eradicated out of existence, whether it's linking to copyrighted material or not. Wikipedia, one of the largest web sites in the world (based on visitor traffic), is blacking out their website until Thursday morning to protest and to raise awareness of this issue. Other websites I tried to go to this morning, such as Raw Story and Michael Moore's, are also taking part. Please call your Congressman and Senators to express your opposition. I don't know how effective it will be; many people called Congress to oppose the bailout, and look how that turned out. But I'd still call anyway.
Wikipedia has a great page with a lot of information and a FAQ on the SOPA and PIPA bills.