Rodster, all criteria are judged equally, appropriate modifications, color scheme, site integration, user experience, and design. If one of them is absent (for instance, if your forum is not integrated into your site at all, just a link from your home page), then that is enough to most likely eliminate it from consideration for the top spots, the rest are just that good.
Most judges use IE, a few use NS, I don't know of anyone that uses opera. If your site isn't viewable in NS, then that falls under the "design" category and will get it eliminated.
