Thousands (maybe tens of thousands) of websites have gone dark today in protest of H.R.3261 the "Stop Online Piracy Act" and S.968 "PROTECT IP," including such Internet mainstays as Wikipedia, Reddit, and at least one very prominent local political site. Other sites, like Google, are registering their protest in less dramatic ways.
There's also an Internet money-bomb making the rounds, urging people to "Vote for the Net" by donating money to the four US senators—two Democrats and two Republicans—who led the fight in the senate against the Internet blacklist provisions before this fight was popular. The two Dems? Oregon's Ron Wyden and Washington's own Maria Cantwell. She may not be one of the most likable politicians you'll ever meet, but Cantwell sure can be an effective legislator.
UPDATE: And from the Actions Speak Louder than Words Department, there's a very competitive race in the new, tech savvy 1st Congressional District, and only one candidate has joined the SOPA/PIPA protest by blacking out their own campaign website for the day. Can you guess which one? Of course: Darcy Burner.