Bad Behaviour needs to continue to stay in development. And it’s developer has suffered a hardware setback (laptop died). So pop over and donate what you can to support development, and keep in mind, freeware doesn’t mean it can’t be supported financially. Think of it as tipping.
Bad Behavior is, of course, one of the first lines of defense for keeping comments free from spam in your WordPress blog. If you’re not running Bad Behavior, you probably should be. He’s offering a link on his thank you page for a $10 donation, pretty sweet if you ask me.