Looks nice, not so sure its wide enough, even on my netbook the blank side bars are significant, on my desktop machine with a decent resolution the waste of browser space looks a little ridiculous half the page is grey side bars, you are not the only site to do this, though other sites fill it with an image, I guess it is so it works fine on things like ipads with rubbish resolution in portrait. Personally prefer sites that dynamically adjust width to browser.
Also the header, images and ads take up too much space, on the netbook the forum doesn't actually start until the bottom of the screen, using the arrow to compress screen by loosing image help but makes the site look poor, need a better header.
The old site seemed to fit both sides of the resolution spectrum well.
Also when you click the red abarthisthi thing top of teh forum the page looks broken as shown in attached.