SIRS General Reference Database Designed for Young Researchers http://ars.sirs.com/discoverer.html
EBSCO Research Databases http://search.ebscohost.com/
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
Ancient Mesopotamia-British Museum http://www.mesopotamia.co.uk/menu.html
Mysteries of Catalhoyuk, ancient city of Turkey http://www.smm.org/catal/introduction/
Egypt's Golden Empire PBS site. Learn about the pharaohs and the common people of ancient Egypt. Explore a day in the life of...a farmer, a priest... http://www.pbs.org/empires/egypt/
The British Museum Ancient Egypt section http://www.ancientegypt.co.uk/menu.html