Some of you may be aware of the excellent Akismet anti-spam plugin available for Wordpress. I've had a decent amount of experience with Akismet and can highly recommend it.
I use Drupal for my personal blog, however, so I haven't availed myself to Akismet for quite a while. I've been using the Drupal Bad Behaviour module which performs just as well as Akismet. I get no comment spam. Like...ever. The Bad Behaviour logs show a ton of it trapped, though.
From a functional end-user standpoint, there's no reason for me to move from Bad Behaviour to Akismet. From a community standpoint, however, it would behoove me to do so. Akismet, you see, shares comment spam information with a central database. Each Akismet plugin checks with that database as part of its anti-spam checks. Therefore, using Akismet lets me share (and benefit from) comment spam information world-wide.
Off I go to switch. I'm nothing if not a good citizen :)