These websites can show you how to train and where you can find races. Also included are websites that help with running and swimming, the two most difficult legs of the triathlon for most.
Triathlete.com This website helps to explain all facets of the sport and is especially good for budding triathletes.
Trinewbies.com An excellent source of workouts for new athletes, this site can provide great information for all.
Getfitnow.com With unparalleled forums, this site has some of the best fitness experts answering questions, many applicable to triathlons.
Totalimmersion.com Teaching many how to swim fast, many articles litter this site and can help to significantly improve your swimming.
Runnersworld.com This site has great information for new runners or runners looking to improve their times.