Below is a list of links to various resources that I have found extremely helpful in achieving my training and fitness goals:
http://www.runnersworld.com/
Lots of information on running, training, nutrition, etc.
http://www.runningintheusa.com/
Local Race Listings and Schedules
http://www.coolrunning.com/
Search for Upcoming Races and Race Results
http://www.runningplanet.com/
Training Schedules and Links to Other Resources
http://www.myfitnesspal.com/
Site/iPhone App for Tracking Nutrition
http://www.runkeeper.com/
Site/iPhone App for Tracking Runs