Sixapart has released MovableType 4.2 with its promised performance improvements (100x faster search, 33-45% faster publishing). I'll probably be upgrading kwc.org tonight, so if you see any outages, you'll know why. I should be re-enabling search/tags now that this update is available.

MovableTypo users: this may be the release that I finally do an upgrade with. Certain things got a bit more complicated (e.g. templates) with MT 4.x, but they claim to have improved those as well.

Also as promised, the reasons for the delayed release have become clear: Typepad Antispam was also announced and is included in the new release. Antispam is Sixapart's dropin replacement for the popular Akismet service. Both a centralized services that snarf in comments and can the spam.