Bad Astronomy
Biology Cabinet - Psuedoscience
BrainBashers: Brain Teasers and Games
Braingle: Brain Teasers, Riddles and more
Brainstorming rules, software and free training
Brain teasers by Barry R. Clarke
Closeminded Science - Examining the negative aspects of the social dynamics of science
Committee for the Scientific Investigation of Claims of the Paranormal
Critical Thinking: A Necessity
Darwin Awards
Dharma Haven - A Harbor from the Storms of Panic and Confusion
Emotional Competency - Explore the Logic of Passion
Fallacy Files
Freethought Zone - Reason and Religion
Hungarian logic collection
Improve Education - Education, Language, and Cultural Issues
Intuitor: How to Succeed through Creative Learning
James Randi Educational Foundation
Logic Machine
Logic Tutor
Marshall Brain's How Stuff Works
Mission: Critical - Critical Thinking Webpage
Museum of Hoaxes
New Scientist - Science and Technology News Service
Orrin's Very Serious Guide to Spiritual Stuff
Philadelphia Association for Critical Thinking
Pzzls - Logic puzzles, puzzling riddles, math puzzles and more
Ratbags, Rascals, and Rogues
Responsible Thinking
Scott Kim, Puzzle Master
Sites for Teachers
Skeptic Magazine
Skeptic's Dictionary
Joey Skaggs - Pranks and Hoaxes
Skeptic News - The "What's New" Page for Skeptics
Urban Legends Reference Pages
View from #80 - Skeptical Reviews of the Paranormal