DSettahr
to wound the autumnal city.
Posts: 5,313
That or:
Dune, by Frank Herbert
We, by Yevgeny Zamyatin (book that influenced Brave New World and 1984)
Rendezvous With Rama, by Arthur C. Clarke
The Mote In God's Eye, by Larry Niven and Jerry Pournelle
Stranger In A Strange Land, by Robert Heinlein
Noir, by KW Jeter
Fairwell Horizontal, by KW Jeter
Cat's Cradle, by Kurt Vonnegut
Slaughterhouse Five, by Kurt Vonnegut
Neuromancer, by William Gibson
Anything by Phillip K Dick, but especially:
A Scanner Darkly
Do Androids Dream Of Electric Sheep?
The Man In The High Castle
Flow My Tears, The Policeman Said
The Crack In Space
(Stay away from Lies, Inc though)
EDIT
How could I forget CS Lewis' Space Trilogy? The books, in order:
Out of the Silent Planet
Perelandra
That Hideous Strength
The Space Trilogy is cool in that it is set during modern day (WW2 actually, which was modern day when they were written) and assumes that the events of Lord of the Rings took place. It's not mentioned until That Hideous Strength, but the descendants of the Numenorean Kings and the Istari play an important part in the third novel.