Jet Set Radio

Cheat Code Central
Cheats and strategy guide.
http://www.cheatcc.com/dc/jgr.html

Game Revolution
Cheat codes. [Dreamcast]
http://www.gamerevolution.com/oldsite/games/codes/dreamcast/jet_grind_radio.htm

GameSpot
Covers Dreamcast version, including review, news, movies, screen shots, and cheat codes.
http://www.gamespot.com/dreamcast/action/jetgrindradio/

IGN
Offers screen shots, videos, review [9.6/10], cheats and hints, and news. [Dreamcast]
http://dreamcast.ign.com/objects/013/013512.html

Neoseeker
Cheats, reviews, discussions, and frequently asked questions.
http://www.neoseeker.com/Games/Products/DC/jetgrindradio/index.html

Sega.com
Official site with story, screen shots and game play.
http://www.sega.com/games/post_gamegame.jhtml?PRODID=177