Ohh yeahh Robert A. Heinlein is great, though some people call him a facist (but I also loved the Verhoeven movie, that the critics hated, I guess I am a right wing anarchist..., no not really, I just realize sarcasm)
But there is also the great Philipp K.:cens0r::cens0r::cens0r::cens0r: (sorry this guys surname equals the male genitalia in the street language), if we talk about SciFi.
Another great read is Jack Kerouacs work, "On the road" is awful inspiring.
And in the Horror corner Clive Barker- Imagica/Book of blood.