I posted two comments to Brad DeLong's blog today, a few minutes apart.
First I posted a comment on the ridiculously overblown George Will / Paul Krugman kerfluffle, pointing out that it's stupid, and actually making a few points. A few minutes later, I posted an almost completely irrelevant "Hey nice post Brad" comment to this long post. Both comments were "held for moderation." The second, utterly pointless post was allowed through. The first, which actually had something to say -- maybe not brilliant, but at least a contribution that questions the one-sidedness of all the other comments -- was not.
I shouldn't be surprised, but I am.