Do I think that SOPA and PIPA (please don't forget about mentioning PIPA - Google, Facebook, etc!) are so bad that a complete blackout would be appropriate? Yes, I do.
But I also think that a call to action is even more important, so hopefully they don't just go offline, but present the visitors with an overlay or a widget or something to call their representatives, and with some clear explanation in layman terms of what SOPA and PIPA do.
"If these companies were to take this route, all of these sites would go completely dark save for a message of opposition to SOPA censorship and instructions on how to contact your local representative."
But I also think that a call to action is even more important, so hopefully they don't just go offline, but present the visitors with an overlay or a widget or something to call their representatives, and with some clear explanation in layman terms of what SOPA and PIPA do.