1UP: Preview, by Sam Kennedy: "Still early in development, but it seems to be the makings of something pretty cool. Ultimately, it's the coop gameplay that will make or break the game."
GameSpot: News, previews, links, and a forum.
GameSpy: Previews, news, screenshots, and movies.
GameZone: Release data, news, and links.
IGN: Screenshots, videos, previews, and news.
Team Xbox: Provides information, previews, and screenshots.