Ping_2_Ur_Pong

Godel Escher, Bach - (Recursion, but not from a software perspective. Its a glorious book that will change the way you think about recursion.)

How to win friends and influence people -Dale Carnegie (The definitive guide to helping you work better with people, truly great book, should be required reading)

Code Complete

Hitch Hiker's guide to the galaxy, - Douglas Adams (Glorious book that is a fun read, when you need a break pick this up and laugh hard)

The Art of Computer Programming

Foundation Series - Assimov (Great stories from one of the best sci-fi writers ever)

Introduction to Algorithms -Cormen

Design Patterns Elements of Resusable OO Design -Gang of Four

Concrete Mathematics

Blink- Malcolm Gladwell

The Design of the Unix Operating System