I like it, I don't think that there are many changes that need to be done.
I would suggest changing the height of the shoutbox to be a bit smaller as you have many forums and the length of the page can be reduced by doing this. Also remove the "Ajax Chat copyright", that doesn't need to be there, and just make the "Shoutbox Chat" link clickable to go to the archive rather than having the link below it.
For the post icons, they are scruffy, you can see that they are clearly not fully transparent, this could be re-done, touched up or just get new images altogether.
Other than that I think is in good shape, I like the way you have the forums layed out. Good luck when applying for the 5*.
I will check back in this thread to make comments later on if I see any more in the future.
Goodjob.