On the subject of this thread, it is interesting to note that Resource Zone complies with COPPA. (And has always had extra requirements for the Adult threads.) It isn't as if the DMOZ hierarchy is unaware of this issue or the compliance requirements.
I'll go you one better, brizzie, where RZ is concerned. Many, many months ago I complained about the Adult section bugging me, and one kind Administrator tweaked my account so as even today, when I go there, there is absoultely no visible Adult thread to me. It is gone as far as I'm concerned. Yet in the internal forum, it's all wide open to underaged editors, even to the point of some having permission to edit there.