Phase III Complete!
As Kayvan suggested, on Susi’s blog, “You could implement MT-Blacklist.”
MT-Blacklist did nothing to help me, during the comment-spam attack. The botnet connections occurred regardless of blacklisting. Server load was up to 110 — where 0.2 is normal — before DP stopped the Apache process. I removed my mt-comments.cgi script entirely, but the requests still came in from over 100 infected clients across the Internets.
I’ve disliked MT since the whole blogspam thing started, and I’ve hated it since 6Apart decided to screw everyone on licensing fees. It would not suprise me to see that they had a helping hand in some blogspamming, just to push people to pay the upgrade fee.