I'm a NASCAR fan! I enjoy watching all motorsports racing (I don't consider drag racing a real race) but since NASCAR is the most prevalent, I'm into it the most. I would prefer to watch Le Mans, F1, CART, IRL, etc but I don't have TV cable. :(
At any rate, I also love computer simulations/games and therefore it stands to reason that I'm into autoracing over the internet. I only use the "NASCAR Racing 2003 Season" sim by Papyrus. I have run my own league (co-admin'd by my friend dlr313) called RCRS (Road Course Racing Series) and currently run in the RTNRL (RacingTexas NASCAR Racing League).