Public Citizen has helped numerous people keep their free speech rights:
The Wikipedia article about gripe sites:
Another list of gripe sites (along with some helpful information about starting your own):
An interesting piece about how at least some lawyers are realizing the pointlessness of threatening or suing the operators of gripe sites, noting that most of them are completely legal:
From the other side of the fence, a company trying to sell a service to shut down gripe sites (worth a read):
Another interesting article about gripe sites in general:
Want to see an awesome pair of C&D’s on a website related to insurance gripes?
http://farmersreallysucks.com/editorialtakedown1.shtml where the site admin takes the Farmers lawyers to school in his response to their C&D
http://farmersreallysucks.com/editorialarentfoxsucks.shtml same site. The admin takes the lawyers to task for being idiots.
http://farmersreallysucks.com/editorialgetafirstlife.shtml again, same site. Easily the most hilarious spoof on a C&D ever. It was written by lawyers for a company called Linden Labs who knew the fast track to infamy was threatening the little guy. They took the ball and ran it back for a positive PR touchdown. I with other companies were this enlightened.
-really sucks admin