Web Sites
Carl Sagan - Pale Blue Dot (YouTube)
TED technology, entertainment, design - amazing talks   
Edge
Thought Experiments - important               
Data is Nature blog
Games for Change (video games)
MIT OpenCourseWare
The National Institute of Play               
Blocks to Critical Thinking
ScienceDaily - brain/mind
The Dana Foundation

REFERENCE
RefDesk - reference, facts, news
The Map Room - a weblog about maps
HyperHistory                       
Thinkmap Visual Thesaurus (pay site)

FRIENDS
Ivan Moscovich - bio - inventor and writer    
    The Big Book of Brain Games: 1,000 PlayThinks of Art, Mathematics & Science
Patrick Huyghe - the other side of science by a science writer/editor/publisher and his Anomalist Books imprint.
Clifford Pickover - a truly mind blowing site
Rita J. King & Joshua S. Fouts - web site
Rita J. King & Joshua S. Fouts - blog
Kate Jones' Gamepuzzles - a unique collection of math-based and very beautiful puzzles and games "for the joy of thinking." Created and made by Kadon Enterprises, each set offers a wide range of challenges, from kid-easy to expert-stumping. Abstract strategy games sharpen thinking skills, puzzles build solving skillsl. Great tools for homeschoolers, too.
Tim Rowett's "Grand Illusions"  Fascinating and novel science related things to buy. 

EDUCATION
(This list will be expanded, but it is also a minefield
as so many people are passionate about their positions.)
Frank Wilson on 'Hand-Made Minds'- Harvard Ed Letter
Infinite Thinking Machine (educator's blog + resources)   
Enhancing Education - Multiple Intelligences       
TED Talk: Sir Ken Robinson: Do schools kill creativity?
Da Vinci Days 2004 (kids having fun)           

FUN THINKING SITES
Ed Pegg Jr's wonderful MathPuzzle site           
Nick's Mathematical Puzzles               
Erich's Puzzle Palace
Potty Puzzles (not what you think - it is the English definition of "Potty.")           
Cool Optical Illusions
Think.com
Aha Puzzles
ClickMazes
Puzzles.com - lots of great links too           
Puzzle World
Puzzlewood - Berhard Schweitzer's site           
Geoff Canyon’s Senket
Yehuda's gaming blog - great links here as well                   
Optical Illusions by Latisse   
Math and Logic Problems Galore
Tom Cutrofello's Passion for Puzzles

COOL TOOLS
Wordle - beautiful word clouds                   
Brain Rules - book review from Tools for Thought

CREATIVE THINKING
quotations for brainstorming and lateral thinking   

CRITICAL THINKING
Foundation for Critical Thinking           

PHILOSOPHICAL THINKING

SITES OF LINKS
Amby's Thinking Skill Enhancers (a little dated)

BOOKS
[Current Favorite] Free Play, by Stephen Nachmanovitch
Flow: The Psychology of Optimal Experience, by Mihaly Csikszentmihalyi
The Thinker’s Way, by John Chaffee, Ph.D.
Frames of Mind: The Theory of Multiple Intelligences, by Howard Gardner
The Art of Possibility, by Rosamund Stone Zander and Benjamin Zander
The art of looking sideways, by Alan Fletcher
Sparks of Genius, by Robert and Michèle Root-Bernstein
Why We Hate, by Rush W. Dozier, Jr. (I've included this book because it casts a
clear light on one of several factors, such as fear that stop us from thinking clearly.)
The Geography of Thought, by Richard E. Nisbett
The Brain That Changes Itself, Norman Doidge, M.D.
The Mind Map Book, by Tony Buzan with Barry Buzan
Thought as a System, by David Bohm
Do You Think What You Think? by Julian Baggini and Jeremy Stangroom (amusing)
A Brief History of The Mind, by William H. Calvin
Flatland, by Edwin A. Abbott - a classic
A Whack on the Side of the Head, by Roger von Oech (insightful and delightful)
How To Solve It, by G. Polya (a classic for mathematicians)
The Artful Universe, (and other books) by John D. Barrow
De Bono's Thinking Course, by Edward De Bono
Thinkertoys: A Handbook of Creative-Thinking Techniques, by Michael Michalko
Handbook of Creativity, Robert J. Sternberg
The Hand: How Its Use Shapes the Brain, Language, and Human Culture, Frank R. Wilson
Hearing Gesture: How Our Hands Help Us Think, Susan Golden-Meadow
Peak Learning, by Ronald Gross
A Theory of Fun, by Raph Koster
The Courage to Create, by Rollo May
On Knowing:Essays For The Left Hand, by Jerome S. Bruner
Rapt - Attention and the Focused Life, by Winifred Gallager

MAGAZINES
The New Scientist
Scientific American
Scientific American Mind
Psychology Today

A LITTLE DIFFERENT
Only Dead Fish (a fascinating blog)           
Nava Ching
Mouse Trap Powered Vehicles               

Thinkers who influenced our thinking...
    Ronnie Samson
    Ivan Moscovich
    John Chaffee
    Roz and Ben Zander
    Howard Gardiner
    Mihaly Csikszentmihalyi
    Robert and Michèle Root-Bernstein
    David Bohm
    William H. Calvin
    Raph Koster
    Alan Fletcher
    Clifford Pickover 

Thought Juggler, we make thinking fun!