Here is an insightful piece  on moral relativism in the New York Times by Paul Boghossian,  Silver Professor of Philosophy at New York University. Definitely worth the read.
Comments Disabled To "Boghossian on Moral Relativism"
#1 Comment By Matt Hoberg On July 26, 2011 @ 4:52 pm
There’s also a discussion on Boghossian’s piece at 
#2 Comment By Dabney Lyles On July 27, 2011 @ 11:04 pm
I suspect that all moral criticisms express something like “we can’t live like this,” as in, “this is antisocial, we can’t coexist with this behavior” or just “I feel gross about this.”
What are our options for separating crappy criticisms from legitimate ones?