I’m leaving this post in place for historical purposes, but quite a while ago I dropped AuthImage in favor of
Spam Karma (link no longer relevant), which seems to do an excellent job of blocking pretty much all my comment spam.
UPDATE THE SECOND:
I’m no longer updating this post to talk about the latest way I’m battling spam here at Sliding Constant (not because I fear the reaction, but because it’s something that changes a lot, and I don’t feel like repeatedly updating this entry). So, as before, I’m leaving this entry in place for historical purposes, but it won’t be updated.