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.
Grand Prix Legends - Papyrus: Official site
Grand Prix Legends Ranking System: Compares your best lap times and "handicap" with other GPL players around the world. Sign up required.
KOTR's GPL Page: (In English and German)
The GPL-Spot: A league offering online races, top times, rankings, and forums.