My Top Ten (in order)
Atlas Shrugged & The Fountainhead- Ayn Rand
*have a 1st edition of Fountainhead*
Demon Haunted World & Contact - Carl Sagan
*made me love science*
Thus Spoke Zarathustra - Nietzsche
Letter to a Christian Nation - Sam Harris
The God Delusion & The Selfish Gene- Richard Dawkins
Ender's Game - Orson Scott Card
1984 - George Orwell
Hitchhiker's Guide Series - Douglass Adams
Slaughterhouse Five & Cats Cradle - Kurt Vonnegut
Moby Dick - Melville
Honorable Mention:
Why I am Not a Christian - Bertrand Russell
Origin of the Species - Charles Darwin
The Five People You Meet in Heaven - Mitch Albom
A Briefer History of Time - Stephen Hawking
*Anything* - Terry Pratchett
Angel's And Demons / Da Vinci Code - Dan Brown
Currently Reading:
The Golden Compass - Philip Pullman (His Dark Materials #1 of 3)