I said a while ago that I was getting tired of stupid spammers putting stuff about their fish tank company or their discount cat furniture (I'm not kidding) in a comment on my blog.
Anyway, you probably already know this (I'm kind of slow sometimes), but Blogger has implemented some good steps to get rid of blog spam.
So, that's why you have to do one of those weird word verification things when you leave a comment on my blogs now.