I'm writing up a proposal for a potential client (weblogs / community site) who realistically will probably get a fair amount of trolls posting, at least initially. This worries them somewhat, but they are willing to hear any thoughts & suggestions on how to deal with this.
So I'm thinking a few things:
1- Have a clearly stated, reasonably lenient/strict policy of acceptable conduct.
2- Have someone who is responsible for enforcing said policy and making the administrative/editorial decision to remove the offending post, perhaps even have someone from the community second the decision.
But wouldn't it be really funny to also have "the troll pile"? Instead of deleting the post/comment outright, the admin would move it to the pile with a link back to the original entry/topic. An aggregate of nutjobs! Hah!
Hrmmm... this could be done with a custom implementation of a del.icio.us clone/tagsurf type of thing.