A brief discussion of the Euthyphro dilemma: its history, formulations, and responses.
Stuff neither Gabe nor Erik wrote, and consequently is way more interesting and accurate:
- Read the entirety of The Euthyphro online, courtesy of Tufts University — which is actually not a long read. Check it out.
- More on how the Euthyphro dilemma relates to divine command theory in the Internet Encyclopedia of Philosophy