Sonic Unleashed

GameSpot
Summary, news, previews, screenshots, videos, and a forum.
http://www.gamespot.com/ps2/action/sonicunleashed/

GameSpy
Provides information, screenshots, and movies.
http://xbox360.gamespy.com/xbox-360/sonic-unleashed/

IGN
Video, screenshots, news, and a message board.
http://xbox360.ign.com/objects/142/14242719.html

Team Xbox
Contains news, information, and screenshots.
http://games.teamxbox.com/xbox-360/1981/Sonic-Unleashed/

Wikipedia
Article describing the story, development, characters, and gameplay.
http://en.wikipedia.org/wiki/Sonic_Unleashed