Social Studies Games
http://games.pppst.com/socialstudies.html - Huge list of social studies games!
http://www.placespotting.com (refresh the page if you get a clue in another language)
http://www.surfnetkids.com/quiz/president
http://www.nationalgeographic.com/features/97/west
http://www.eduplace.com/geonet
http://www.sheppardsoftware.com/Geography.htm
http://www.lizardpoint.com/fun/geoquiz
http://www.quia.com/cb/1001.html
http://www.funbrain.com/cgi-bin/getskill_s.cgi?A1=selects&A2=geo&A4=1&A7=0
http://www.eduplace.com/geonet
http://www.nationalgeographic.com/geobee