1. Exit, Voice and Loyalty, Albert O. Hirschman

2. Micromotives and Macrobehaviour, Thomas C. Schelling

3. The Strategy of Conflict, T.C. Schelling

4. Positive Economics, Richard G. Lipsey

5. Just and Unjust Wars, Michael Walzer

6. Essays in Trespassing, Albert O. Hirshman

7. Information and Investment, Richardson

8. Beyond Economics, Kenneth E. Boulding

9. Great Political Thinkers, Plato to the present,

10. Choice and Consequence, T.C. Schelling

11. Strategy and Choice, Richard Zeckhauser

12. Economic Development in the Third World, Michael Todaro

13. Positional Goods, Fred Hirsch

14. The Art of Loving, Erich Fromm

15. Uncommon Sense, about Ludwig v. Bertalanffy and General Systems Theory

16. Small is beautiful, Schumacher

17. Creating Public Value, Mark Moore

18. Getting to Yes, Fisher - Uri

19. The Psychology of Attitude Change and Social Influence, Zimbardo

20. Thinking in Time: The Uses of History for Decision-Makers, Ernest May/Richard Neustadt
 

(as of March 2001 - the problem being that the list gets outdated from time to time, as I read other, even better books)