Outside of elections, I generally stay out of politics, on the (admittedly dubious) theory that constructing an informed opinion and bringing about appropriate social change would take too much time away from things I care about more, like science and free software. But this is one case where political developments threaten both of these things. SOPA and PIPA would permit, under certain circumstances (which one would be very optimistic to expect will include only circumstances one agrees with), the courts to order that payment providers not deal with a site, search engines not list a site, and name servers not keep records for a site. That's like preventing a supermarket from selling bagels to criminals, or preventing anybody from mentioning the name of a criminal that Big Brother wishes never existed. There are even rules in these bills against providing means around DNS censorship: as every SSH client in the world implements proxys, every SSH client could be construed as illegal software.
Human knowledge depends on keeping the Internet open. We can't let this happen. Call your congresscritters today! Or tomorrow, if you prefer, while there will be plenty of reminders throughout the Web. :)
My dad, who worked at the school Chuck Schumer's daughter attended, tells a funny story about Schumer storming into the upper-school office and insisting that the reason his daughter was getting uniformly bad grades was that all of her teachers were incompetent.