I like this post by Derek Thompson on inequality in the US. It's not polemical, instead presenting important facts in the easy-to-understand graphs and charts. Most of it I knew previously, but not this:
When you add it all up, we have a country with steep divisions between rich and poor and a tax code that for all of its problems is progressive (although it has been more progressive in recent year). Here are two more graphs to take you home: the first shows share of income by quintile and the second shows share of federal income taxes by quintile. What you'll see is that income inequality is behind tax burden inequality.The whole post is worth reading, and the accompanying graphs are enlightening.