Chances are there is going to be a fair amount of code posted on this forum. Attempting to read code like: http://community.magento.com/t5/Programming-Questions/How-do-I-add-product-count-to-main-navigation-... can be hard at the best of times. Since the sidebar doesn't really add much content relavant to the post page I would suggest if possible changing the post page layout to be 1 columnIt much easier to read without any drawbacks as far as I can tell.
I'll +1 that, however I haven't noticed this as much, since I setup the forum to run in full width. I made an extension for chrome that does this automatically, I linked it over here: