Philosophy: Logic, Language, and Psychology 
Essential
Why Do Intellectuals Oppose Capitalism?
By Robert Nozick: "Wordsmith intellectuals fare well in capitalist society; there they have great freedom to formulate, encounter, and propagate new ideas, to read and discuss them. Their occupational skills are in demand, their income much above average. Why then do they disproportionately oppose capitalism?"
Intellectuals and Socialism
"In 1949, Hayek attributed the dominant position of planning in the West to the role of intellectuals, by which he meant 'professional second-hand dealers in ideas' such as journalists and commentators."
The Ayn Rand Lexicon: Objectivism from A to Z
"This mini-encyclopedia of Objectivism is compiled from Ayn Rand's own statements on some 400 topics in philosophy, economics, psychology, and history." Now available online.
Recommended
The Foundations of a Free Society
By Nathaniel Branden. "The Soviet Union has invaded and successfully conquered every country on the planet, with one exception: New Zealand. The Soviet Union has chosen not to invade New Zealand. Question: Why? Answer: So we would know the market price of goods."