WEB WONDERS:  The Constructivist Classroom compiled by Carol Pool

The 21st Century Learning Initiative

http://www.21learn.org  Web site includes lots of resources - including whole books- on constructivism

Harvard Project Zoo

http://pzweb.harvard.edu  All about multiple intelligences, active learning, constructivism, and more....

Web Museums

http://www.Iam.mus.ca.us/webmuseums/  International directory of online museums

Internet Astronomy School

http://www.yarden.ac.il/blossoms.htm  Located in Israel, with educational activities, student projects