Will Wilkinson has a couple of snappy posts, defending his paper "Thinking Clearly about Economic Inequality" against attack from Jon Chait and Matt Yglesias/Conor Clarke. If you think it's just obvious that wealth inequality and diminishing marginal utility commend redistribution through taxation, then you should probably read Will.
(Chait's original column is here; Matt's blog post is here; and Conor's is here.)