Comment Spam... they ruin it for everybody

Much as I've enjoyed letting you folks comment without registering, I'm going to have to lock down comments to registered users only. It costs nothing beyond your time to register, but I recognize that it's inconvenient.  Sorry about that. My spam filters let a bunch of stuff through, and rather than try tightening them up, I'm just going for the throat. I realize that this will stifle discussion a bit, but not nearly so much as wading through threads full of spam would. --Howard