Just a note: Rampancy.net has a feature called throttle that gradually disables site functions as traffic goes up, in order to prevent the entire thing from catching fire, falling over, and sinking into a swamp.
We tested it with the last Bungie Weekly Update we hosted, and while the site was unavailable for part of the night, generally we were pleased, and had less downtime while also being able to serve more users.
However, with the Halo 2 launch craze, we're getting higher than usual levels of sustained traffic, and so the site may disable some of these functions in order to cope. Think of it like Cortana disabling some of her functions while trying to keep all that Halo data intact.
So if you're trying to make a comment, or view newsfeeds, or use some of the other of the site's advanced functions, and all you get is a blank page or a MySQL error-- just wait awhile and try later. It doesn't mean the site is broken or crashed, it just means it is trying to cope with the increased load.