The blackout of over 7000 popular websites a couple of weeks ago got a lot of media attention and cooperation from several big websites, like Wikipedia, Google,.. The result: PIPA and SOPA are thrown in the waste basket, and most of the former supporters suddenly discovered that they are against PIPA/SOPA. Strange how people can suddenly discover these things about themselves :-)
So it seems this virtual action not only achieved its goals, but achieved it quite well.
But the fight isn't over. PIPA and SOPA weren't the only idiotic and rights-abusing laws the US was trying to force upon us, they were just the most recent and biggest immediate threat.