http://apod.nasa.gov/apod/astropix.html

This site provides a new image every day from NASA, all having some connection to space.

http://www.howstuffworks.com/index.htm

A great site for finding out how things work, like how nuclear power is generated, or how artificial sweeteners are made.

http://www.funbrain.com/

A fun site with games, activities, and educational learning opportunities.

http://www.hoagiesgifted.org/hoagies_kids.htm

The definitive gifted website, with links to smart toys, contests, book lists, and more.