If you get the current version of Spaminator from the plugins repo and are using a nightly from Jan/05/05 or later, it’ll filter comments, trackbacks and pingbacks.
Wait…did it say I need to be using a nightly? MtDewVirus’ Trackback and Pingback Moderation plugin was testing on the 1.3 alpha code. Fortunately Spam Karma was made and checked for both 1.2 and 1.5-beta versions, and hopefully he’ll release a new version that’s more improved in checking trackbacks. I’d be more comfortable with 1.2, especially with my schedule getting more hectic.