Last night hacktivist group Anonymous carried out a massive DDOS attack on multiple government websites, along with the RIAA and MPAA's websites. We were lucky enough to be sitting in on the 4chan thread as it was happening (NSFW language, obviously).
CNN: "Hacktivist" collective Anonymous took credit for taking down the sites Thursday after the arrests of leaders of Megaupload.com and shut down the popular hub for illegal media downloads.
CNN: Hours after the announcement of the arrests, some of Megaupload's fans turned the table on the feds, knocking the U.S. Department of Justice and the FBI websites offline.