I was wondering what you thought about "locking" the current header at the top of the page. Basically set the site up so the menu items Home, Forum, etc - always appear at the top of the page. Only everything below it is scrolled.
I know of a few sites like this and it allows for some nifty navigation.
I started to work on it when we first switched to this design but it didn't scale to the monitor sizes real well for those with smaller monitors. I will work on it again though and maybe shrink the header to accomodate this and let you know how it goes.
The actuall header with the "logo" does seem to be a waste of space. Perhaps by making that smaller you can get something worked out - if it makes sense that is.