Wikipedia's the only striking site that got the mainstream media interested. There's been 4 million lookups on Wikipedia's zipcode finder so far today. (Full data will be released in a day or two, when the WMF staff have had any sleep.) Wikipedia took the entire existence of SOPA mainstream.
I may be biased because the UK mainstream electronic media coverage has been substantial - I've been doing radio for two days, others have been doing television (including Jimmy Wales on Newsnight, which is seriously important here). I don't know what the US media coverage landscape looks like - has it hit mainstream electronic media, or are they treating it as something those funny Internet people are making a fuss about?
(Edit: The post-blackout press release. 8 million zipcode lookups.)
Congratulations on the media coverage!
Our sister site apparently is:
Interesting, my model of Robin Hanson had him say something about the blackout and how it shows people are hypocrites. Though obviously he has strong opinions on intellectual property. I think it would have been a good idea to Blackout LessWrong today. It would have given us a status boost in most of the communities we frequent.