Gravity's Rainbow (Pynchon) The Notebooks of Malte Laurids Brigge (Rilke) The Age of Extremes: A History of the World, 1914-1991 (Hobsbawm) Bhagavad Gita Upanishads Crimes Against Logic: Exposing the Bogus Arguments of Politicians, Priests, Journalists, and Other Serial Offenders (Whyte) Tractatus Logico-Philosophicus (Wittgenstein) edit: added 2 more & author names
That being said my additions to the mix are:
Siddhartha by Hermann Hesse
Dhammapada
Tipitaka (http://www.accesstoinsight.org/tipitaka/index.html)
Perennial Philosophy by Aldous Huxley
Discipline and Punish by Michel Foucault
Philosophy in the Flesh by George Lakoff