For classic fallacies, see http://www2.ca.nizkor.org/features/fallacies/ Fallacies are dialectic AntiPattern(s).
The above is really a rather nifty web. It tends to confuse selling with installing, however. Remember, a wise man once said: "Logic is overrated as a system of thought". -- RonJeffries
With apologies to Churchill, logic is the worst system of thought except all those other systems that have been tried from time to time. -- JimPerry
A lot of FallaciousArguments have since been discussed on c2.