SixApart better solve this MT spam issue soon (yes, we’ve tried MT-Blacklist but that didn’t work for us). We’ve been slammed with comment spam over the past week and have had to turn commenting off until further notice (if you try to post a comment now you’ll get a page not found error). We hope to have it back on late next week when we move 37signals and SvN to its own dedicated server. We just can’t risk server downtime on our other projects because comment spam is sucking all the server resources.