Following are some readings, which I found particularly interesting and enjoyable in the following subject areas:

Computer Science / Programming:

Fred Brooks - Mythical Man Month
http://en.wikipedia.org/wiki/The_Mythical_Man-Month

Douglas Crockford - Javascript: The Good Parts
http://www.scribd.com/doc/15490908/JavaScript-The-Good-Parts-by-OReilly-Media

Humanities, Psychology, Philosophy:

Marcus Aurelius - Meditations
http://classics.mit.edu/Antoninus/meditations.html

Carl Jung - The Undiscovered Self
http://www.scribd.com/doc/20500034/Carl-Jung-The-Undiscovered-Self