Hmm, I'm gonna be useful and give some proper constructive criticism (and of course my opinion).

I kind of have to agree with many people here that I do prefer dark colours, because lighter colours do tend to hurt the eyes a bit.
But I do like that it will fit the style of the rest of the site better. For the titles of the forums you could have black or dark grey, and for the forums themselves, instead of being so light, they could have a lighter grey colour instead of being so similar to white. (personally, I think a grey colour like the category colours we have right now would work, although maybe a bit lighter) Also I don't know whether you'd want to change the rest of the site's graphics but the colour scheme could be changed to be just a
little bit darker so it fits the forum front page a bit more. But that's just a personal opinion.
But really, the colours are my only complaint right now. Everything else, like font, little forum images (those white boxes that fit to the rest of the site) and the layout seems to look great for me.
...Just doing my bit. :3