nice, I really like the whole color scheme you have going on their! That green really brightens stuff up, so many forums these days use blacks, greys, etc for some reason. brighter colors are better!
Only real big problem I see is that your forums are way to skinny. I could think of two possible solutions to this problem.
1. make the site liquide, meaning make it strech across the entire screen, without the black on the right and left
2. take out all the boxes you have on the right of it.
Personally, I would prefer it to strech the entire screen. It would add a lot more detail to the site
Good luck with it though