Pretty nice, one thing that really bugs me is the background for table headers that you have.. (
http://www.oyobiia.com/images/767546bee91b72772.png ). The middle line going through it makes it hard to read the white text ontop.
Another thing is you should make it so images in peoples signatures don't get resized through highslide resizer it looks like you're using? Also you have it set to resize external images.. but when you click the bar to view full it doesn't open it inside the forum like it should.. it opens it in a new window completely which is kind of annoying.
Not too fond of the colors myself but that's just me.