Content middle, teasers to the right is standard layout in most websites, we could argue if we keep the navigation on top (as does postgresql) or put it to the left.
The forum postings and news should be treated as teasers and go to the right I think.
The teasers should have a different color background and the heading for the teasers should not be so high (our blue background is to large for my taste, as is the font size).
You could also look at http://cognovis.de/loesungen/ for some ideas where to place the elements (e.g breadcrumb or search bar). We use a split of main navigation and subnavigation.