A reasonably well-configured comment spammer has been fluttering against our filters for about a month now. None of it gets through, of course, but his activity was filling our logs and distorting our stats. I culled out all the machines he's used in the past 24 hours (about 55) and "banninated" them. However, as is typical when I do these sorts of things, it's possible I've also banninated you. If you find you can't comment, just e-mail me, I'll try to figure it out.
And if anyone running a blog out there which still uses regexps to stop spam needs a really killer list of REs, let me know. About 2 dozen REs on our list stop 99% of our comment spam here.