Basic Economics by Thomas Sowell
Applied Economics by Thomas Sowell
Free to Choose by Milton Friedman (video series, too)
Use of Knowledge in Society by Hayek (short, non-technical paper which is full of brilliant insights): http://www.econlib.org/library/Essays/hykKnw1.html
Not a book, but the Econtalk podcast is fantastic: http://www.econtalk.org/