Nicene Theology has an excellent summary of Augusting on Justification.
hungry 4 God has a helpful reminder that one of the key elements in good apologetics isn't the thinking involved. The post focuses on a case where Christians are ridiculed for being unintelligent or anti-intellectual, and it points to some important scriptural guidelines that aren't normally associated with apologetics but really are relevant to this sort of issue. The one thing I like less than apologists who give bad arguments for conclusions I agree with is apologists who have a nasty attitude while giving their defense of Christianity. Sometimes it's much better to listen and say little, asking key questions and not arguing for much, than it is to mount a defense whose content would be quite impressive but with a manner that would cast much darkness on the content through insulting the hearer.
21st Century Reformation learns some lessons from Jonathan Edwards' life about commitment to developing godliness and character.
A Physicist's Perspective offers some insightful thoughts on harm principles in ethics. Specifically, the argument is that some people try to avoid calling certain actions wrong because of their lack of harm. This post provides some interesting ways to show that there may well be harm anyway. I'm not endorsing every detail, but I think this sort of general approach is extremely important, because it just isn't true that harm principles automatically will allow what most people want to argue that they allow. My favorite example is incest. I think sexual relations between a brother and sister are harmful, but I can't think of a good secular argument why they should be harmful in principle as long as there's no chance of conception, and both parties are consenting adults. That complicates such discussions, and both sides have something to learn from thinking carefully about that sort of thing.