Color Landform Atlas of the United States
The Color Landform Atlas of the United States contains topographical and political maps to the county level for each of the fifty states. Each state link brings up a menu of links to maps and other online information about the state.
http://fermi.jhuapl.edu/states/states.html
INTELLiCast Weather Service
INTELLiCast provides one of the most colorful and user-friendly sources of current weather information, images, and forecasts on the World Wide Web. (It's a lot like a TV weather report.) The service, created by WSI Corp, covers national and international weather as well as the weather in several major U.S. cities. Much of the information is updated daily.
http://www.intellicast.com/
NASA Photo Gallery
This online library of all NASA's images contains a huge number of fascinating photographs.
http://www.nasa.gov/multimedia/imagegallery/index.html