Due to a relentless amount of spam, I had to shut down new posts on my Lymphoma discussion forum, which was run on phpbb. Spam is becoming a real problem on my wiki as well. Somehow, Haloscan doesn't seem to have much of a problem with spam, not sure why that is.

I'm not sure why spammers even bother. With Google's nofollow directive

Anyway, I'm sure there are good anti-spam measures that can be taken on phpbb, but it wasn't worth it since nobody was really using my forums anyway, so I just took the easy way out and prevented any new posts from being made.