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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/

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/

Racers Edge - Gran Turismo 4
Offers real-time record lap submission database for live competition
gt4.unixdoctor.com/

Dug Motorsports Gran Turismo 3
Includes car and track lists, sponsors, screenshots, manufacturers, links, real car pictures, chat room, and forum.
members.aol.com/

Racers Edge - Gran Turismo 3
Offers top submitted lap times.
gt3.unixdoctor.com/

Gran Turismo Gold Junkies
Offers record times for GT3 tracks and tips for driving the tracks.
www.goldjunkies.com/

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

Gran Turismo 4 Online Racing and Community
Offers a friendly community for Gran Turismo 4 players to compete online via time trials as well as discuss game tips and share information about the game.
www.gt4.us/

Gran Turismo 4 at GameXC
Offers game info, review, screenshots and news.
ps2.gamexc.com/

Gran Turismo 4 Resources at GameSpy
Media and other downloads for Gran Turismo 4 offered by Gamespy Network.
www.fileplanet.com/