I am really enjoying how the software looks and works, you have put a great deal of work into it, and it feels very smooth and nice. I just have these ideas:
-Make the posting/thread creation page a little nicer, more design.
-On the post-view pages, it looks very white. Try adding some simple borders to make it easier on the eyes.
-Remove the "your account" tab (the one next to members), we already have the same dropdown on the left.
It looks good, and this may become a purchase I want.