Health
Your body like a car
Eating for Health and Performance
Nutrition Guidelines
10 Best and 10 Worst foods for your Health

Pace and Workout Utilities
There are several utilities on the web that attempt to predict race times from a performance at a different distance.  Below are links to several of these.

CharlesWilber.com -Java required -1500 through Marathon -no 1600 or 3200
Runner's Web  -Mile, 5k, 10k, 1/2 Marathon and Marathon only
 
Track and CC Performance, Goal Setting Utility and workout tools:
Track evaluator
Track goal setter
Event converter
Workout tool

Also, Runners World Magazine has a nice collection of calculators.