Reddit is going dark on SOPA Blackout Day, January 18th, 2012 to protest SOPA. Facebook is planning a press event that day as well. Show your support – download this script and put it online. Say NO to censorship and shut them down.
see the demo
Minor edit: If you’re thinking of blacking out your main website homepage, be sure to read these comments on SEO effects on how to avoid issues, directly from Google.
Script adopted from jQuery infinite rotator.