There is a lot of great information regarding fitness and nutrition on the WEB nowadays.  Unfortunately, there is a lot of misinformation as well, that can confuse and frustrate folks looking for reliable information.
The following fitness and nutrition sites are "expert" approved and definitely good sources of information.

www.eatright.org   The official WEB site of the American Dietetic Association.  The largest group of nutrition experts in the world.
www.fitday.com   A free fitness and nutrition tracking WEB site that allows people to track food fitness and weight daily. 
www.cookinglight.com     Great recipe WEB site sponsered by the excellent magazine.
www.americanheart.org      The American Heart Associations official WEB site.   Great Recipee archive.
www.epicurious.com      Everyone should know "how to cook".   Here is technical support on learning a lost art!!!   Awesome recipe archive.
www.scandpg.org     Find a sports dietitian in your area!!!   Eva is listed under San Francisco Bay Area sports dietitians.
www.soyconnection.org     Great soy recipes     Check out their soymilk smoothie ideas...fantastic resource.
www.rachaelray.org       Love her show.  Love her WEB site.  What else can you say.  Very nice recipe site.
www.exrx.net      Finally a reputable weight training and fitness WEB site.  American College of Sports Medicine referenced.   Very nice collection of resistance training exercises.
www.dietitians.ca./      The dietitians of the great white north score big with their excellent WEB site. Bravo Canada.    Very nice job on their information presented.
www.teamintraining.org   Want to get fit for a great cause...check out Team in Training in your local area.  Get fit and fight the number two cause of death in US...cancer.
www.bitwine.com      Hundreds of dietitians available to chat with or just instant message with a quick question.  Make sure you choose a "advisor"  with RD behind their name...that stands for Registered Dietitian.  A qualified "nutrition expert".

www.webmd.com     Great, reliable weight loss and general health status tips.
www.diabetes.org   The official site of the American Diabetes Association.  Great meal planning/fitness ideas