Last month I went into some detail about the measures that I've taken to reduce the amount of comment-spam. Despite all of the protection in force, a few hardy YSMs have managed to get through the barricade. Not many, and not a lot to be worried about.
Nevertheless, there's no harm in strengthening the defences.
The upshot of this is that for the last week or so I've been trying out the WP-SpamFree plugin and I can confirm that it's caught every scrap of spam since installation. It's got a few nice bells and whistles such as logging options and the facility to set up safe contact form (I'm not using this yet), so it's worth a look-see.
Just how long it'll take for the malevolents to figure a way around it remains to be seen, so I'll keep you posted.