Yahooligans! (Yahoo for Kids)
http://www.yahooligans.com/

ALA Great Sites for Kids
http://www.ala.org/gwstemplate.cfm?section=greatwebsites&template=/cfapps/gws/default.cfm

KidSpace @ The Internet Public Library
http://ipl.org/div/kidspace/

OneKey
http://www.onekey.com

KidsClick
http://www.kidsclick.org/

Ask Jeeves for Kids
http://www.ajkids.com