The Relativity of Biblical Ethics - Joe Edward Barnhard argues that the Bible itself exemplifies moral relativism. - http://www.positiveatheism.org/writ/bibethics.htm#BIBETH
Morality and Atheism - An examination of the theist assertion that one cannot accept both atheism and objective moral standards and that objective moral standards prove that God exists. - http://www.eskimo.com/~cwj2/atheism/moralath.html
Are God and Ethics Inseparable or Incompatible? - An in depth treatment of the moral argument for God and the meta-ethical argument for atheism. - http://hem.passagen.se/nicb/god_ethics.htm
Morality Without God - Jonathan Blumen discusses whether morality is evidence of God. - http://www.spectacle.org/1095/moral.html
The Biological Basis of Morality - Scientific fact sheds light on age-old ethical questions. An article by Edward O. Wilson. - http://www.theatlantic.com/issues/98apr/biomoral.htm
Human Ethics and Morality - Exploring the relationship between ethics, morality, evolution, psychology, culture and genetics. - http://www.onelife.com/ethics/