One thing which I remember seeing once was that Lawyer A had emailed site B with some threat of a lawsuit, and B's lawyer immediately filed in court for a declaration that A's threat was frivolous and harrassing, so that B should get some sort of automatic damages if A ever sends another communication on the same topic again.

I wasn't sure what legal principles were involved, or whether that declaration was granted, but the whole idea was pretty kickass; "this is so obviously something which you can't sue me for that I'm going to have a court shove that fact up your rear end."