The National Arts and Education Information Network Curriculum materials for classrooms K-12 from the Kennedy Center for the Performing Arts. Links include integrated lesson plans, and sites that are appropriate for young students. This site is a data base of information about children's authors and illustrators, and their books. Most include some biographical information. Many have activities for students to do.
Some information is basic advertising for their work.
ED's Oasis ED's Oasis provides links to what educators around the country recommend as the most engaging student-centered web sites, and examples demonstrating effective classroom Internet use from successful teachers. Franklin Institute Science Museum Online exhibits from this Philadelphia museum include pictures and Quicktime movies related to a broad variety of science topics. All of the activities are designed so that the children can do them using every day, inexpensive materials. You won't want to miss the Story Hour, where some stories are read aloud, some are written by adults, but others are written and illustrated by children. Mathematics From the University of Kansas, this site includes freeware and lesson plans to help reinforce basic math skills.