General:
iRacing.com - The most realistic simulation to date
Fast Apex - Good site with info for iRacing begineers
iRacer Stuff - New site for iRacing wih many setups, information and downloads.
SimRacingDesign - A site I administrate that does work for NASCAR Racing 2003 Season
 
Setup Websites:
 
Setup Guides/help:
Race Line Central - An old NR2003 site but has very good information
iRacing-Club - Quick explaination of all the garage options
Setup helper - a program that can give quick information on how to improve your setup
  
Drivers:
Shea Racing - Michael Shea from Alaska (Soon to be North Carolina)
 
Other:
South Whidbey Road Service - Road service from iRacer Ray Fournier of Whidbey Island, WA