Image by Mark Klotz, used with a Creative Commons License
A logical fallacy is a flaw in logic typically used in an argument. There are several types of logical fallacies. Learning to identify logical fallacies can help you identify flaws in other people's arguments, evaluate the credibility of sources, and avoid flaws in your own arguments.
Yourlogicalfallacyis.com - This provides a list of common logical fallacies, along with examples.
The University of North Carolina Logical Fallacy Help Sheet - this describes specific logical fallacies, provides examples, and then gives suggestions on how to avoid using fallacies in your own arguments.
Spurious Correlations - Humorous examples of random statistics that show a correlation to each other, but most likely do not show causation.