I ask that the entire Blogosphere be required to at least skim the following links:Indeed, and I second.
Logical Fallacies and the Art of Debate
And, the most inclusive
A Handbook of Rhetorical Devices
Relatedly, Papa Pooh may remember the day I returned from summer camp, having taken a class in 'logic'. At dinner that night, I shot him down with "that's an ad hominem fallacy!" At the time, he did not regard the money as particularly well spent, and perhaps still does not.