I think that's a really good idea, Terr. Unlike all of the other antipoint system suggestions, I don't see any ways this could be abused, or other sorts of conflicts.

The only problem is maybe it wouldn't be all that effective? Not being able to post in a subject would eventually put it pretty far down on the totem pole that is AO's forums. It might be a waste of time to make posts that won't be read very often Positive-Antipointable. (or whatever

On the other hand, there is that new "similar threads" function..

At any rate, i think it's an awesome idea.