Great site for examples of constructivism in use and ideas for implementing in a classroom.
Site includes information epistemology, learning theory, and application of constructivism. Also provides insight as to why there is no one agreed upon "constructivist theory of learning".
Page briefly describes constructivism based on the works of Jerome Bruner. It includes information on the principles of readiness, spiral organization, and going beyond the information given.
Good site for suggestions for teaching using a constructivist approach.
This site has a great simplified contrast of Cognitive Constructivism and Social Constructivism.
This page is a collection of links on constructivism put together by Martin Ryder at the University of Colorado at Denver.