I don't know if you can implement it, but a forum I'm on has a post limit per day. New members are only allowed 30 posts per day. Admins can upgrade people's accounts allowing them to post more.
I have to mention that on this forum almost everyone is level 1 (30 posts). A few are level -1 (warned and 20 posts) and a couple are level 1+ (i think it's 60 posts)
This, if possible, would at least force spammers to cut back, and make people who like to post a lot become better members to earn the ability to post a lot.
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