The Critical Thinking Community
http://www.criticalthinking.org/
This organization's aim is to promote essential change in education and society through the cultivation of fair-minded critical thinking.
Critical Thinking - Wikipedia
http://en.wikipedia.org/wiki/Critical_thinking
Wikipedia, the collaborative, online encyclopedia, provides an overview of critical thinking, methods of critical thinking, and links to related topics, such as cognitive bias, logical fallacy, inquiry, reasoning, and more.
***For collaborative purposes, we are using the social bookmarking manager "delicous." This enables the collaborative gathering and tagging of websites that fall under topics relevant to critical thinking.