Because I've been having a huge problem recently with spam comments showing up on old posts (and apparently I am not the only person this is happening to), I've decided to moderate comments on posts more than two weeks old.
I am not exactly happy with this development, since many of my old posts continue to get (legitimately) commented on, and I think having an unmoderated comment section works best for discussion purposes. I'm also not crazy about the additional work it will take for me to personally read and approve every comment. But that's less work than what I do now, which is to read them all (I get comments emailed to me), and then, if they are spam, look for the post they're attached to and delete them there.
So we'll see how this works. At present, the only comments I don't intend to approve are spam, so dissenting readers, please continue to comment. The mod queue is not there to weed you out.