It seems like we have been getting an increased amount of spam in the last 6 months, so I'm trying a new approach.
New users to the forum will require approval from a moderator before their messages are posted. Once a message is approved, they are able to post without moderation.
Let's see how that goes. Also, if you have been active on the board for a while and would like to be a moderator, I'll add you to the list.