Grand Prix Legends

Gamespot.com
[8.9/10] Reviewed by: Stephen Poole. "...arguably the most intense racing experience ever seen on a personal computer." Also includes screenshots and reader reviews.
http://www.gamespot.com/pc/driving/grandprixlegends/index.html

The GPL-Spot
A league offering online races, top times, rankings, and forums.
http://amsberg.ods.org/gpl-spot/

Grand Prix Legends Ranking System
Compares your best lap times and "handicap" with other GPL players around the world. Sign up required.
http://gplrank.schuerkamp.de/

KOTR's GPL Page
(In English and German)
http://www.kotr.de/GPL/