Here's a list of dislikes regarding your site:
- color choice - it may scare people off. I recommend something neutral for your topic.
- horizontal scrollbar visible at 800 resolution - about 40% of users are still using 800*600 resolution
- there is nothing telling me what the site is about
- your ads stick-out like a sore thumb - try text-only ads if you need ads or use them within the forumdisplay
- etc