Macroeconomics, fourth edition, by N. Gregory Mankiw, Worth Publishers. Please see the website for the textbook for additional materials and study aids.
Optional Supplemental Reading
Macroeconomics, Third Edition, by Andrew Abel and Ben Bernanke, Addison Wesley, 1998. This text is a very readable, modern treatment of intermediate macroeconomics. It gives a nice balance of theory, real world applications and political considerations. The text stresses intuition over formal models and mathematics. I have used this textbook in the past for econ 301. It is at a slightly more advanced level than Mankiw's textbook.
The Age of Diminished Expectations, Revised and Updated Edition, by Paul Krugman, MIT Press, 1997. This is a very well written short monograph on current economic conditions and economic policy. Paul Krugman is a professor of economics at MIT and is thought of as one of the brightest economists of his generation. He is also a regular contributor to the online current affairs magazine Slate and to Fortune magazine.
I also recommend several other short monographs on current issues in macroeconomics. The first is Peddling Prosperity: Economic Sense and Nonsense in the Age of Diminished Expectations, by Paul Krugman, Norton, 1994. This monograph is a more politically oriented discussion of economic conditions and policy during the 1980s and early 1990s than Krugman's The Age of Diminished Expectations.
The next is Memos to the President: A Guide through Macroeconomics for the Busy Policy Maker, by Charles L. Schultze, Brookings, 1992. Charles Schultz was on President Carter's Council of Economic Advisors and this monograph is a collection of "memos" briefing a hypothetical president on economic issues.
Also of interest is Hard heads, Soft Hearts, by Alan Blinder, Addison Wesley, 1987. Alan Blinder is a professor of economics at Princeton University and was recently on President Clinton's Council of Economic Advisors and was vice chairman of the Federal Reserve System.
Last, I recommend Macroeconomic Essentials for Media Interpretation by Peter Kennedy, MIT Press, 1997.