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GTPlanet
Features game information for the whole Gran Turismo series of games including Gran Turismo 4. Also has thriving community forum.
www.gtplanet.net/

Neoseeker: Gran Turismo 2
Contains cheats, guides, links, frequently asked questions, screenshots, and a discussion board.
www.neoseeker.com/

Gran Turismo 4 - Official US site
This is the official Gran Turismo 4 website from Sony Computer Entertainment, Inc.
www.us.playstation.com/

Gran Turismo 4 at GameSpot
Offers game information, review, screenshots, news, downloads, cheats and more.
www.gamespot.com/

Gran Turismo 4 information site
Offers screenshots, a car list, and game and track information.
mysite.wanadoo-members.co.uk/

Gran Turismo Planet
Offers game information including a full car list as well as links to Gran Turismo 4 resources around the web.
granturismoplanet.com/

Gran Turismo 4 at IGN.com
Offers reviews, previews, game information, multimedia downloads, screenshots, comprehensive guide (for registered users) and more.
ps2.ign.com/

Gran Turismo 4 at MetaCritic
This site offers links to a lot of reviews on the game and gives it at "meta" score based on these reviews.
www.metacritic.com/

Dug Motorsports Gran Turismo 2
Information on cars, tracks, sponsors. Also includes a FAQ, chat, forum, links and photos of real cars.
members.aol.com/

Gran Turismo 3 Tuner's Vault
Tuning setup database and a car list.
www.gtvault.com/