I now see why you have a 'spam watch section' judging by the rubbish posted on here in the last 24hrs.
One way to eliminate all spam would be to use a better forum as the Snitz forums are very basic.
phpBB are very good as are Ikonboard.
Making new members reply to an email by clicking a link to verify their address is good.
Making members enter an on screen code with their registration also deters spambots.
Administrators having to approve all new members before they can post is another option. I can't remember offhand if the snitzforums has this option.
While I appreciate that the administration of any forum can be time consuming, I'd be happy to offer my services to build you a better and more secure forum, and even administrate it for you should you wish.
I have experience in construction and administration of message boards with over 5000 members, and regardless of the forums agenda the security principles are the same.
If you would like to discuss my proposal further please feel free to contact me either by replying here, or email.
Thanks
kind regards
Dave