Rhizome is joining sites like Reddit, Internet Archive, Wikipedia, and others tomorrow in blacking out our site for 24 hours to protest and raise awareness of PIPA and SOPA. We believe in an open internet and recommend other organizations consider participating in this important action.
For more information, please check out EFF's coverage of this and other "blacklist" creating legislation. Updates from the blog Tech Dirt are also essential reading. Further information and templates to join in the internet blackout are located on the site American Censorship.