Just War Theory
Stephen L. Carter, "The Violence of Peace: America's War in the Age of Obama" from Yale Law Librarians on Vimeo. An excellent talk/discussion of President Obama's policies and just war theory. Stephen Carter is a professor at Yale Law School who concentrates on ethical issues.
Stanford Enclyclopedia of Philosophy This is the single best online resource in philosophy. The articles are carefully done and meticulously reviewed and are updated as needed. The model for an online encyclopedia.