The logic of arguments, and their fallacies.

Steve Novella, of NESS, and the Skeptics Guide to the Universe, has a good article on How to Argue.

A guide to examining the premises and logic of arguments - including a list of logical fallacies.

Arguing is one of those activities most people do but few people do well. Many do not understand what a logical argument even is or how to do it correctly. Yet arguing is an essential skill of critical thinking. How we argue reflects how we think, how we evaluate our own conclusions, and how we challenge the beliefs of others.