Websites and Articles

Three great organizations to improve different elements of each sport:
USA Triathlon
USA Cycling
United States Masters Swimming

Great website to track workouts
Beginner Triathlete

Calculate your running pace with the first link, calculate your triathlon splits with the second link:
Cool Running Pace Calculator
Triathlon Conversion Calculators

Great website to map your ride or run depending on where you live via GPS:
Gmaps Pedometer

Some interesting articles about multi sport training:
The science of base training
Training for  your first triathlon
Foam rolling for sore spots
Sweat rates to plan for optimum hydration