This would be a somewhat complicated feature to implement so I'm probably wasting my keyboard's breathe posting this but why not implement some kind of system that would help both promote new boards and create a better "flow" of traffic throughout the site (ie getting more users to visit a more diverse selection of boards).
My idea is this, a click for click exchange with an adsense-like layout in a small corner of the site. A board mod can sign up for it and for every click that their board generates they will receive a click from someone else's board, similar to BlogRush ( http://www.blogrush.com/ ), which has been very popular on blogs.
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