KidsOLR http://www.kidsolr.com
Ivy's Search Engine Resources for Kids http://www.ivyjoy.com/rayne/kidssearch.html
ThinkQuest http://www.thinkquest.org
Virtual Library: Museums Around the World http://www.comlab.ox.ac.uk/archive/other/museums/world.html
Yahooligans! http://www.yahooligans.com