Offer some sort of incentive. Of the hundreds of promotion forums, why go on yours? Ask yourself that when you are on it. If you think like a user/consumer new to your site/product it will help bring more people in.
As for the contest, I've been thinking about it but have decided against it previously because of lack of funds for a contest that will really be successful. It's definitely a possibility.
@el canadiano: Good idea. I do think the current theme is solid but not spectacular, so I will probably look into a new theme.
@Kirisute Gomen: Hmm. I have the .info domain for 50 posts as something that makes us different. Though truthfully some new ideas, preferably unique, are needed.
@Wolfy: Thanks as well, appreciated. I don't think that would be a popular enough contest, but it could perhaps be a third prize or something. 😛