Critical
Thinking online resources: 
Compiled by Dr. Kenneth B.
Hunt
Hot Skills Employers Want! Critical thinking: seeing the big picture and being analytical; comprehending what you read. It is a process we can use to sort out conflicting claims, weigh the evidence, let go of personal biases, and arrive at reasonable views. It also allows us to avoid Conversational Cheap Shots.
More about fallacies http://www.drury.edu/ess/Logic/Informal/Overview.html
A Brief History of the Idea of Critical Thinking http://www.criticalthinking.org/university/cthistory.html
http://www.calpress.com/critical.html
San Jose State University Tutorial Course in Critical Thinking: an interactive tutorial for critical thinking. http://www.sjsu.edu/depts/itl/
Why Critical Thinking? http://www.extension.umn.edu/distribution/citizenship/DH5645.html
Core Concepts http://www.kcmetro.cc.mo.us/longview/ctac/toc.htm
WannaLearn.com
http://www.wannalearn.com/Academic_Subjects/Critical_Thinking/
There are helpful free Instructional Sites here.
Logic Games, IQ tests, puzzles, & trivia http://www.puzz.com/
Critical
Thinking Across the Curriculum http://planet.tvi.cc/ctac/resources.htm
Teaching
Support Services http://www.tss.uoguelph.ca/onlineres/critical_thinking.htm
Dan Kurland's www.criticalreading.com
http://www.uah.edu/library/internet/logic.html#critical
UAH http://www.uah.edu/library/internet/logic.html