I think it's worth while to append two references to this very useful and entertaining thread. They are both rather old, and more oriented to the world of usenet, but I think still quite applicable, not to mention fun reading, especially the second.
1) Trolling Lore
is a very good overview of the subject, and food for thought, as an explanation of certain phenomena one sees on forums on 'teh interwebs.'
2) Linked from the previous page is the roster of types of Flame Warriors
, which is a very amusing menagerie, indeed. I recognize aspects of myself in some of these critters.
Probably many of you have seen both of them previously, but I'm posting this for the rest of y'all.