KnowFallacy

Be less wrong.

This application provides an index of some of the more common formal (logical) and informal fallacies and includes a simple quiz to practice recognition.

Definitions and examples, from http://en.wikipedia.org, are used according to the terms described in the Creative Commons Attribution-ShareAlike license, located at http://creativecommons.org/licenses/by-sa/3.0/legalcode.