• Piaget
• Vygotsky
• General
• Intelligence
• Information processing

Piaget

• Jean Piaget's Theory of Development 

Fairly comprehensive tutorial on Piaget from Margaret Anderson, SUNY Cortland. 

• Regents' Center for Early Developmental Education 

The Regents' Center site at the University of Northern Iowa has good articles and resources on Piagetian constructivism for teachers, along with an annotated bibliography on constructivist education. 

• Jean Piaget Society 

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Vygotsky

• Cultural-Historical Psychology 

Al Cheyne's (University of Waterloo) site with links to electronic papers and other resources on Vygotskian thought.

• Mind, Culture, and Activity 

A journal devoted to Vygotskian/Sociocultural Theory.

• Laboratory of Comparative Human Cognition (LCHC) 

Active research laboratory (Michael Cole et al.) at University of California, San Diego, with good information and links related to Vygotsky. 

General

Cognitive Science Eprint Archive

Provides free worldwide access to the primary scholarly and scientific research literature on a scale that is likewise impossible in paper.
 

Millennium Project

A list of the top 100 most influential works in the 20th Century.

Intelligence

• Theories of Intelligence 

Nice table of different theories/conceptions of intelligence with some references, links, and brief descriptions. From the Great Ideas in Personality site, Northwestern University.

• The Theory of Multiple Intelligences (MI) 

A more detailed description of Gardner's Theory of Multiple Intelligences, by Lynn Gilman

• Reviews of The Bell Curve 

Book reviews on Richard J. Herrnstein and Charles Murray's "The Bell Curve: Intelligence and Class Structure in American Life." 

Information Processing