If you have an interest in Logic, and you should, then you ought to visit the Philosophy Page as well (under Misc).

• Why Study Logic? - Gary Crampton
• God and Logic - Gordon Clark 175k
• Logical Fallacies of Christian Arguments - Infidels 200k
  
  Mistakes in logic made by Christians when arguing with nonbelievers.
  Though this is written by nonbelievers, use it to help refine your arguments.