Wealth of information from the United States Department of Agriculture on the dietary guidelines and nutrition of Americans.
www.mypyramid.gov

It includes a kids page
www.mypyramid.gov/kids

Informational site about eating healthy. It focuses on fruits and vegetables and contains games, videos, and music.
www.dole5aday.com

Activities, printable nutrition charts, recipes, and games. (For Kids and Grownups)
www.applejuice.org/fungames.html
www.applejuice.org/grownup.html

Filled with information for Parents, educators, and schools.  It contains a games page for kids.
www.nutritionexplorations.org

The nutrition cafe is a page of interactive games on making healthy food choices.
www.exhibits.pacsci.org/nutrition