I figured that maybe a list of websites people use for different sports could be useful.

Official Sites
FIA official site
Formula1.com
motogp
World Superbike
British Superbikes
NASCAR
IndyCar
Champ Car World Series
World Touring Cars (WTC)
World Rally Championship (WRC)
British Touring Car Championship (BTCC)

General Sites
autosport

F1/Motorsports News and Information Sites
itv.com
BBC - Formula 1
Pitpass
grandprix.com
The Guardian
f1 play.com
F1 Nutter
planet-F1
crash.net
totalf1.com
f1-live.com
freshf1.wordpress
SpeedTV
touringcartimes
btccinfo
btccpages

F1 Technical Sites
F1 Sporting Regulations
F1 Technical Regulations
f1technical.net
scarbsf1
f1-country.com

F1 Teams

Red Bull
Ferrari
Renault
Mclaren
Williams
Mercedes
Lotus
Sauber
Toro Rosso
Force India
Marussia Virgin
HRT


Moto GP
Moto GP & Superbike Live.com
Honda

Road Racing
real road racing

Drag Racing
eurodragster