Henry Hazlitt, Economics In One Lesson
Not much new there for someone with some understanding of Bastiat, etc., but I do think it is a good means for introducing the subject of free market economics, libertarianism, etc. to those unfamiliar with the arguments for such.
Eric Rauchway, The Great Depression & The New Deal
A nice introduction to the basic chronology of the subject as well as the substance of the various programs of the Hoover and FDR administrations regarding the financial problems of the Great Depression. While I disagree with what I see as its generally positive view of the New Deal, I think it does provide a good jumping off point for an understanding of that era and the government efforts the time.