Here are just a few and I'll add more as I have time and they come to me.
Wing Chun related sites
The Ving Tsun Self Defense Academy (This is Sifu Matthew Johnson's school)
The Online Wing Chun Encyclopedia
Ving Tsun Athletic Association
The Maine Acadamey of Wing Chu Kung Fu
Yip Man Search Page (You can find my Sifu's and Sigung's information here)
Indianapolis Wing Chun at MySpace (add me as a friend!)
Martial Arts related sites
Complete Martial Arts.com - Most comprehensive site for all areas of martial arts related subjects including styles, history, people, movies, books, etc.
BudoSeek! - An online community for Martial Arts by Martial Artists
Health & Fitness related sites
Gymboss Timer - This item is a MUST have, absolutely indispensible for ANY timed athletic training.