Not to be outdone, IGN also has some new Halo 2 stuff up-- thanks to Louis Wu at HBO, where we noticed the news. Their full trailer footage, like GameSpot's, are for paying subscribers only, but they have some free teaser clips. They also have the same screenshots as GameSpot, but without watermarks. Then, of course, they have their own trailer impressions.
GamerFeed has their reaction to the press conference as well.
Also, it has become apparent that the trailers and teasers that both sites have for their members may or may not have been authorized by Bungie. FYI.