Argument Champion, a game that uses logical connections between words to pwn your opponent.
YOUR QUESTION: You have the ability to, for one night, reanimate any two historical personages (“historical” = “not currently alive”) and have them discuss/debate a topic of your own choosing. Which two historical personages do you choose, and what subject do you have them discuss/debate? (from MeFi's own Jscalzi)
How to Argue With Zompist: Or Social-Skills 101 A helpful guide for online discussion and debate written by Mark Rosenfelder with some help from notmydesk and others.
The Hierarchy of Disagreement: Based on Paul Graham's essay "How to Disagree" (prev), the diagram ranks the types of arguments that can be made. Not quite the same as logical fallacies but a useful guide to measure whether you're making a good argument or if "you are an ass hat".