MapMyRun is a web site specifically geared for getting the most out of your running/walking/cycling experience.

Fitday is a free online fitness and nutrition journal used by over 2 million people.  Fitday is great for tracking your personal fitness and nutritional goals. Enter your goals and track them by logging your daily diet and physical activity. Fitday will take care of the rest, showing you how much weight you've lost and how close you are to reaching your goals. It will also map out your nutritional intake, showing your fat, protein, carbohydrate, and vitamin consumption for the day.