The ACLU works to "defend and preserve the individual rights and liberties that the Constitution and laws of the United States guarantee everyone in this country." These rights include free speech, equal protection, due process, and right to privacy.
The CMLP is affiliated with the Berkman Center for Internet & Society and the Center for Citizen Media. The site provides resources for those involved in online and citizen media. Excellent legal guide, blog, and legal threats database.