Philosopher (and friend) Massimo Pigliucci recently concluded a series of seven essays about ethics on at his blog Rationally Speaking. In these seven essays, Pigliucci discusses everything from meta-ethics (is there right and wrong?) to ethical theories (what is right and wrong?) that are person-focused in nature (deontology, virtue ethics) to ones that are more societal or political (consequentialism, egalitarianism). Here is a list of the entries and their subject matter. I highly recommend them as reading for anyone interested in exploring the basic of ethics. First article: meta-ethics. Second article: consequentialism. Third article: deontological ethics. Fourth article: modern virtue ethics. Fifth article: contractarianism. Sixth article: egalitarianism. Seventh article: the full picture, a summary. Enjoy.