Some old that I have re-read, some new, all worth your time:

Old Man And The Sea - Ernest Hemingway

IQ84 - Haruki Murakami

The Last Lecture - Randy Pausch

On Writing - Stephen King

When Bad Things Happen To Good People - Harold Kushner

Catcher In The Rye - J.D. Salinger

Notes To Myself - Hugh Prather