Well, I figure I'll add some that are sorely missing from this list:
Fast Food Nation: The Dark Side of The All American Meal - Very well researched book about a serious guiding force in the development of world economies. Gives a whole new perspective.
Manufacturing Consent (Noam Chomsky) - The classic on media bias (Althought many argue the book itself is biased
).
A Mathematicians Apology (G.H. Hardy) - A number theorist bashing all other human pursuits while justifying his own life. An excellent book.