I don't mean to be "that guy", but unless your sites have a lot of traffic from non-technical people, I frankly doubt anyone will care.
Most techies already know about SOPA, already dislike it and have probably already signed a petition/called/written. If they haven't by now, they aren't going to.
Putting a message on a tech blog/website is like preaching to the choir at this point.
My sites are relatively insignificant, I only reach an audience of 100k-200k users.
My post was intended as a message of encouragement for those with a significant non-techie userbase to bite the bullet and consider a protest shutdown.
It's my belief that non-techie users are far more likely to take an anti-SOPA shutdown maintenance page more seriously than a forum post or added element in the regular page layout of a site.
Most techies already know about SOPA, already dislike it and have probably already signed a petition/called/written. If they haven't by now, they aren't going to.
Putting a message on a tech blog/website is like preaching to the choir at this point.