SPAM Prevention

Thank you to the authors of making this awesome forum software!

I ran the old version of the forums on my site since August 2007, but only launched the site recently, and now I'm running the new beta version of PunBB. So far I really like it. But some spammer has posted a whole lot of crap on my forum. I found this thread...
http://punbb.informer.com/forums/topic/ … e-mod-v08/

I think its a great idea. I'm going to make some kind of mod like this...

Also what I want to make is a section where I can enter auto ban words. And if the user enters those words in their new post, their post is automatically quarantined and their IP banned.
Then I'll just fill in cialis, viagra and all that crap.

It will probably be a crude mod. I'll post again in the Mod section when I've done it.