The person who coined the term "Cyberspace" in the phenomenal book Neuromancer. We try and get him at DEF CON each year, if we could only get past his agent!
Phillip K. Dick
His story 'Do Androids Dream of Electric Sheep' inspired the majestic dystopia of Ridley Scott's 'Blade Runner'. That sinking feeling that the world you can see is not the true world? That's PKD country.
What can I say? All of these books are excellent all for different reasons.
The Diamond Age, or, A Young Lady's Illustrated PrimerInterfaceIn the Beginning...was the Command Line
You will notice similarities between the excellent True Names and Neuromancer
True Names...and Other DangersTrue Names: And the Opening of the Cyberspace Frontier
ColossusColossus And CrabThe Fall of Colossus
William C. Dietz
Aldous Leonard Huxley
The comments above aren't mine. They are from the original site. I am really kind of disappointed in my showing in this category. I really would have thought my list would be much more complete. Color me illiterate I guess.