The NY Times has a lengthy article on trolling and some of the more high-profile anonymous/pseudonymous trolls on the Internet.  Interesting I guess. 

I think for the first 3-4 years of ComixTalk we didn't edit anything and then at some point I switched things to a "civility policy".  Under both systems, I've never felt particularly obligated to respond to trollish comments although inevitably I've had to write to it from time to time.