The fourth beta of Movable Type 3.2 (soon to go final) added a version of the SpamLookup plug-in that integrates with the new Junk Comments feature. Comments are assigned a numeric score based on a few factors that decide whether a comment is immediately published.
That plug-in, combined with MT-Blacklist (and quite few customized blacklist strings that I added) have cut down the spam comments that get through to almost none. Two spams did get through last Saturday. Not bad, considering that there were over a hundred attempts this week.
The downside, of course, is the false positive. A few legitimate comments have been moderated. Not too big of a deal, but it can be a bit disconcerting to post a comment and not see it posted until the blog author gets around to unmoderating it. As I learn how to use SpamLookup, I will be tweaking my settings to minimize these false positives as much as possible.
Unfortunately, Movable Type seems to only allow one to whitelist those who have registered through the TypeKey authentication service.
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