I got hit with a flood of comment spam tonight, starting at about 7:30pm EST. I discovered it at 9:30, after I was done teaching, and spent 30 minutes entering URLs into MT-Blacklist and rebuilding. There were well over 100 spams already there.
Looking at my log, it appears they're still trying--I show a bunch of blacklist-denied comments over the past ten minutes. I'm going to hope I got the bulk of their URLs, and am going home and going to bed. I'll assess any new damage in the morning.
Update: PZ Myers pointed out in the comments that Theresa Nielsen Hayden had gotten the same flood of spam, and had posted her blacklist. She also posted a link to Kip Manley's blacklist. Both are here
I've imported both of their blacklists, so mine includes everything they had. Mine's here.
As Kip says in Theresa's comments--add these now if you have MT-Blacklist running, or you'll end up having to despam by hand later, which is a serious pain.
Update 2: Just checked my MT activity log. During the twelve hours since I finished updating my blacklist last night (around 10:30pmEST), there were 510 rejected comments, from 142 different IP addresses. The storm seems to have subsided for now.
Jay Allen, you're my hero!