Google has censored their logo that links to information about the bill and ways individuals can make their opinions heard.
Artists don't support SOPA. Neil Gaiman posted an open letter to Washington signed by himself and a variety of other artists. DeviantArt also opened a forum for artists to discuss the bills and the opinion is overwhelmingly negative. Deviants on the site also create art as protest against it such as these:
Stop SOPA Bill by =sakimichan
Death by Censorship :Anti-SOPA: by ~Tomago-Life
Ponies Against SOPA by *Otterlore
This TED talk explaining why SOPA wouldn't work is awesome if you want to learn more about it.
If you live in the US and like having freedom on the internet, please contact your congressman and let your voice be heard.