Sonic Riders

GameFAQs
Release data and a message board.
http://www.gamefaqs.com/console/gamecube/data/929721.html

GameSpot
News, previews, images, videos, links, and a forum.
http://www.gamespot.com/gamecube/driving/sonicriders/

GameSpy: Sonic Riders
Provides information, interviews, and screenshots.
http://ps2.gamespy.com/playstation-2/sonic-riders/

IGN: Sonic Riders
Preview, news, screenshots, and videos.
http://ps2.ign.com/objects/770/770346.html

Team Xbox
News, screenshots, and a movie.
http://games.teamxbox.com/xbox/1311/Sonic-Riders/