They couldn't beat you in court really. Remember.. the "Sucks" sites won. Ie.. PaypalSucks.com Foxtvsucks.com nikesucks.com
About the best they can do is send a C&D and hope they scared you into submission.
Find the sucks site that won and reference that case in a letter back to them telling htem you would be more than happy to take them to court and have them pay for both of your legal fees when they lose.
You can read this too...
http://www.wired.com/news/politics/0,1283,38056,00.html