SantiagoLegal.com

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

Gran Turismo 2
Best time and top speed sections, news and an article on game bugs.
jove.prohosting.com/

Gran Turismo 2 Speed of Light
Information, game assistance, and multimedia.
www.angelfire.com/

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

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

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

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/

Rapid Gaming - Gran Turismo 4 Review
Gran turismo 4 review
www.rapidgaming.com/

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