as I have said, this is really a good work. However, you should not make it too complicated. People like it because of its simple design.
Here are my sugegstions how I would improve this style:
1. background of .row should be white
2. if you want that background, at least use the same background for statistics, it is "disturbing"
3. make the Lock more visible, for example yellow/gold color http://bluesilver.net23.net/styles/blue ... locked.png
4. I dont understand the meaning of "Forums" dropdown menu in header on index. There are 2 lists of forums on the index now, what is it good for? I consider it disturbing
5. Remove View active topics from dropdown and put it on the same line as View unanswered. If user is logged in, display also View new posts and View your posts there
6. add hover effect for Search button
7. Remove alt texts from top menu, it is also disturbing OR add alt texts to all buttons in top menu (it is better if it is equal)
8. i would also remove the #top and .sub-menu2 so it is even more simple and clean design