If you follow the mail a letter to your MP tool it does pretty much everything for you. Just type in your name and contact email and it fires it off to your local MP cc'ing people in government.
I understand its probably a insignificant attempt at stopping this shit storm, but it's easy enough to do. Hopefully some good will come of it.
If you don't know what sopa is, youtube....Otherwise read this website and it gives you a pretty good description of what this bill will do to you.
If you use the internet or have electronic devices, this concerns you.