The recent Nassau Institute lectures by Lawrence Reed of the Foundation for Economic Education (FEE) and Yaron Brook of the Ayn Rand Institute on Liberty and Character and Free Market Revolution respectively were simply great.
And Isaac Morehouse offers even more excellent food for thought in his eight part series on the morality of capitalism.
Hope you can take the time to read them at the links below.
The Morality of Capitalism: Introduction
I'm sure you'll also enjoy the links within each article.