ad/sponsorship opportunities that may be available for that site. If the traffic is enough to justify the cost, I go ahead and throw a little money at them to see what happens. For some sites, my sponsorship has paid for itself a few times over. For others, nothing.
Fun - and smart on your part Brody!
Take it a step further... for the directories that did well, ask the owners if they'll rent their mailing list. If yes, offer an incentive to sites in complementary niches in return for a link.
The fact those sites are in the directory means their owners (may) know a little bit about marketing and may be receptive to the offer.