Wahoo! Thanks to the clear details from Jay Allen, Killing Comment Spam Dead, in relation to an earlier yelp, it looks like we are flipping the score on comment-blog-spam.
It wa snot too much work to download and install 3 MT plug-ins and modify the various MT templates. There is a small but not painful delay on loading of comment previews, but the trap works.
Two more URLs for Jay’s blacklist that have infected us (deliberately “dotted” so no extra google points for these cretins):
mneuron(dot)com
satellite(dot)menguma(dot)com
Life is good. So far.