If you live in the U.S.A., I encourage you to contact your legislators and ask them to vote NO on SOPA/PIPA! If you don't know who they are or how to contact them, Wikipedia can let you know. They are blacked out today but you can put in your zip code and find out who you need to get in touch with. This blackout is a good example of what the Internet could end up like if these horrible bills are passed!
When you contact your legislators, please remember to be insistent, but polite. Don't use harsh language and don't let your emotions get in the way of the real point. Be clear, be concise, let them know you really mean business, but do so in a way that is not going to turn them off. Even the best of intentions can be ruined if the delivery is not executed well
If you are not in the U.S.A., I don't know how you can protest, but I encourage you to if you have a venue available! As you may already know from today alone, these bills have the potential to affect the entire Internet! Can you imagine where we'd all be if deviantART and other art communities were forcibly removed? These sites could be targeted because of how much fan art is on them.
These bills violate everyone's rights, not just Americans'. Unfortunately, the people that make laws in the U.S.A. often think they're in a position to regulate the entire world. We need to let them know we're not going to stand for this kind of censorship against free expression. You, me, and everyone else in this world should have the right to express themselves through art, so please make sure the U.S. government knows this!
EDIT: Thanks to *NinjaKitty--x
for providing a link where non-US citizens can sign a protest petition. Go here and help fight this destructive and horrible law! [link]