This is a *great* article by "Answers in Genesis" (a Young Earth group, BTW) listing a bunch of arguments creationists should NOT use, because they are either completely false ("moon dust thickness proves young moon") or at least completely unsubstantiated by evidence ("light speed has decreased over time").

Arguments we think creationists should NOT use

A few from there:

• ‘Moon-Dust thickness proves a young moon’
  
• ‘Woolly mammoths were snap frozen during the Flood catastrophe’
  
• ‘The 2nd Law of Thermodynamics began at the Fall’
  
• ‘No new species have been produced.’
  
• Canopy theory
  
• ‘There was no rain before the Flood.’
  
• ‘Evolution is just a theory.’
  
• ‘The speed of light has decreased over time’
  
• ‘There are no transitional forms.’