Here is a top ten list of my personal (not-so) favorites:
9. False Dilemma: A choice is presented as either/or when in fact there are numerous options. Example: Do you walk to school or take a cab?
8. Poisoning the Well: Presenting a negative comment before a person speaks, to discredit their idea. Example: Joe seems to think he is an expert on this. Let's hear what he has to say.
7. Guilt by Association: Rejecting an argument because the person proposing it is connected to someone disliked by the hearer. Example: Your cousin is a liar, so I cannot believe anything you say.
6. Genetic Fallacy: Endorses or disqualifies a claim based on its connection to a (negative) history. Example: Volkswagens are lemons, because the company was founded in Nazi Germany.
5. Non sequitur: Conclusions that do not follow from the premise. Example: Since we have no money, it is important to boost our spirits by going out to dinner.
4. Begging the question: This assumes that the thing you are trying to prove is true. Also called a circular argument. Example: Barth has the best theology because he is the most influential theologian.
3. Appeal to pity: Accepting an argument because of sympathy or emotional appeal. Example: You should buy this newspaper subscription from me because it will help keep kids off the streets.
2. Appeal to the popular: Accepts popular opinion as an automatic reason for change. Example: Students don't like to receive grades, therefore they should be eliminated.
1. Special Pleading (double standard): Applying special status to the validity of an assertion because of the status of the person promoting it. Example: You cannot refute what I claim, because you are not: a woman, in the union, etc.