The Citizen Media Law Project (CMLP) is based at Harvard University’s Law School and the Berkman Center for Internet & Society. I’m biased toward this project, because I co-founded it and blog occasionally on the CMLP website. The project features resources ranging from a database of legal threats to, most recently, the Online Media Legal Network, which “connects lawyers from across the country with online journalists and digital media creators who need legal help.”
The Electronic Frontier Foundation, a non-profit based in San Francisco, works to preserve our liberties in the technology and cyberspace spheres. I also have some bias here: In 2002 the EFF honored me with one of its annual Pioneer awards, and I’m friendly with the organization’s founders, John Perry Barlow, John Gilmore and Mitch Kapor. (I’ve also been a financial donor to the EFF, and I urge you to do the same.)
There’s an enormous amount of useful material at the CMLP and EFF websites. I’d strongly suggest that you look around, especially if you have any questions about what you might encounter as a creator—or host—of online content. They aren’t the only excellent resources, and we’ll list many other sources on the Mediactive website as well.