Yep. I'm thinking there are plugins that connect most major forums up to Project Honey Pot. It's definitely not a bad idea to install something like that.
Doesn't seem to be doing a whole lot to curb registrations, though, probably because half of them come from "trusted" hosts (i.e. virally infected home PCs, VPS/dedicated servers, exploited boxen, etc). It's definitely helped cut back on the "lawl random IP" registrations that I got a lot of, but right now I'm dealing primarily with bots registered from VPS/dedis.
Luckily, it's pretty easy to get in touch with them, so I've been shooting them e-mails to report the spammers.
It's kind of funny how much time I spend maintaining this place. Between yesterday and today I probably spent 2.5 hours just dealing with spammers. That's pretty ri-goddamn-diculous.
I'd probably dick around and get Akismet working if more of them were able to successfully make posts. Last time I tried using Akismet here it broke the site.
I'm also considering finishing up that SMF2 theme I was making eons ago and updating the site to SMF 2.0 RC3 so that I can use Bad Behavior, since I heard that it works extremely well. Considering SMF2 doesn't seem to be on the road to ever becoming "stable," that idea is looking to be more and more attractive as time goes on.