I just finished Capitalism and Freedom a couple weeks ago.
My favorites from him:

"There's no such thing as a free lunch."

"Inflation is always and everywhere a monetary phenomenon."

Be sure to check out these two recent interviews w/ Milton Friedman, by Dr. Russ Roberts.

EconTalk, Friedman on Capitalism and Freedom: "Russ Roberts talks to Milton Friedman about the radical ideas he put forward almost 50 years ago in Capitalism and Freedom. Listen to the most influential economist of the past 50 years discuss the principles of liberty, social responsibility of business, the inertia behind bad legislation and his career as economist and public intellectual."

EconTalk, Milton Friedman on Money: "Russ Roberts talks with Milton Friedman about his research and views on inflation, the Federal Reserve, Alan Greenspan and Ben Bernanke, and what the future holds."