Handy in a logical pinch... - I thought of submitting this link because of the frequency with which I read and hear poorly constructed arguments. The logical Fallacies: Index is a list of logical fallacies you might encounter in everyday life, or even when reading the news. I report that with sadness, but you'll find politicians and the-man-on-the-street alike supporting their opinions with a hefty dose of logical fallacy.

Some favorites are:

• Straw man
  (a favorite in one-sided TV commentary)
  
• Argument from Ignorance
  (a favorite of the paranormal crowd)
  
• Against the person
  (a favorite in online forums)
  

But choose your own favorites!