I'm going with Blogger's word-verification for comments. I'm not exactly inundated with it, but comment spam seems to target the content of individual posts. I receive email notification of comments already, but it doesn't tell me which post was commented upon, so sometimes I have to dig through my archives to find and delete the intruder. This is annoying. I just got a comment on a post that included the word g-o-l-f, and the comment includes a link to some b-e-t-t-i-n-g site. We'll see how this word verification works.