The Electronic Frontier Foundation, an organization that has co-signed several coalition letters with my publication The Multiracial Activist in the past, has published a useful legal guide for bloggers:
EFF: Legal Guide for Bloggers: http://www.eff.org/bloggers/lg
EFF: Fighting for Bloggers' Rights: http://www.eff.org/bloggers/
Press release: "Justice for Bloggers": http://www.eff.org/news/archives/2005_06.php#003677
Check the EFF's resources out. There are plenty of organizations and individuals out there who feel nervous or threatened by unfettered blog commentary and reporting.