Several of you have asked my opinion on this matter.
The truth is that there are many people who can explain this matter much better than I, although I doubt there is anyone that can explain it without bias.
After reading a lot about it SOPA/PIPA appears to be a poor attempt to solve a considerable problem. But this solution is really appears to leave open so many loopholes and answered questions that it scares the crap out of most of the internet. I do think a lot of the reaction is overreaction, but
their there is reason to be concerned.
You cannot legislate and regulate the internet like a brick & mortar business.
So, while you look for sites that are actually operating during today’s protest, here’s a decent explanation video.