Free Republic has the results of a survey of 28 distinguished scholars on the 10 books that every college student should read.  They are:

1.   The Bible
2.   The Federalist Papers
3.   Democracy in America
4.   The Divine Comedy
5.   The Republic
6.   The Politics
7.   Nicomachaean Ethics
8.   City of God
9.   Confessions
10. Reflections on the Revolution in France

And don't forget to read my Ten Books Every College Student Should Own.