@Wayne
You've voiced my concerns exactly - however I cannot think of one great fix-all solution.
The idea I had on the other thread was limiting DMZ participation to people with more than x posts (perhaps anyone above "merely curious?"), but I'd imagine that could lead to borderline spamming to get to "DMZ status".
Some amount of user moderation like slashdot could maybe help - if a very large number of people "voted" a post bad then it could go down a level of significance or be reported automatically to mods. But I guess that'd be a lot of work to implement, and might not work with sites smaller than /.
Perhaps a filter could be implemented that stops pictures larger than a small size appearing and converts them into links (so custom smilies will appear, but nothing else). Or one that blocks posts with less than ten or so characters. Or, perhaps a timer could be added like on phpBB to stop posting in quick succession (the infamous double/triple posts).
But one good thing - when was the last flamewar? :-o :-)