Voelspriet.nl has initiated an idea to rid communities (be it forums, blogs, whatever) of trolls. Not get rid of them by banning them or nuking their posts, no, by accepting their trolly messages and keeping them at ease. The smart thing is that this anti-troll plug-in only shows the trolly stuff to the troll itself. That way, the other community members need not suffer.
Will it work? Maybe.
Maybe not on SEO forums, but surely it will work on communities with members who are less web-savvy and not used to bypass tricky stuff like this.
It's not ready yet, but coming soon......