The first thing that you need to decide is what kind of visitors that you want to attract to your forum. Targeted marketing is much more effective than untargeted marketing. I took a short look at your forum, and it's very webmaster-centric. What kind of webmaster are you trying to attract? New ones seeking help, or experienced ones that are prone to discuss advanced topics. It would be more effective to target one at a time, although there is nothing wrong with a mixed campaign.
Once you identify who you want to target, think about what they do. What kind of resources do they need, what kind of entertainment attracts them, etc. You should give serious thought to starting a content section to add to the forum, it will give visitors something to discuss, debate, and distribute. I noticed that the "Free Webmaster Resources" and "Tutorials" sections are members only. Is there a reason why they are members only? Those two topics have the potential of drawing new webmasters to the tutorials, and experienced webmasters to the free resources. However, requiring a registration to access them will turn a lot of that traffic away; there are many other forums and websites offering those things that don't require registration.
If you post the target audience that you want, then we can probably come up with more specific ideas for you to try.
Also, I have posted a comment to your contest in
this thread.
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