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Information on everything!!  Encyclopedia of Earth.

Another general info site is Encyclopedia  of Life.

The World Factbook provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 266 world entities.

Time for Kids has age appropriate informational and news articles.

Science Kids has cool science and technology information.

National Geographic Kids--so much great stuff here!

Kids World Travel Guide--see the world through children's eyes.

Ducksters.  Fun games and all sorts of information.