http://www.timeforkids.com/TFK/
Tim e magazine for kids online - fantastic site for current events.
http://www.socialstudiesforkids.com
Social Studies topics from geography and government to history and holidays.
http://www.lizardpoint.com/fun/geoquiz
Test your geography knowledge.
http://www.nationalgeographic.com/kids/
National Geographic games and activities and lots of good information
http://www.historyforkids.org
Information about ancient cultures
http://earlyamerica.com/series.html
Videos on a variety of Famous Americans and events
http://www.earlyamerica.com/earlyamerica/notable/notable2.html
Notable Women of Early America