update: I removed this plugin. I now just trust in Spam Karma
Spam Karma does a great job of managing my comment spam. But I’d like to do more to keep those 500 comment spams/day out of my database entirely. So I’ve installed the Challenge plugin. It’ll make you do math in order to leave a comment. Spammers hate math. It’s like their kryptonite. I hope you don’t hate math so much as to not leave a comment.