KidsClick! http://sunsite.berkeley.edu/KidsClick!/
Yahooligans http://yahooligans.yahoo.com
Berit's Best Sites for Children http://www.beritsbest.com/
Ask Jeeves for Kids http://www.ajkids.com/
Cyber Sleuth Kids http://cybersleuth-kids.com/
Fact Monster: an online almanac, dictionary, encyclopedia and homework help http://www.factmonster.com/