Scared? Just wait till you read some of Daniel Suarez
grin

Scary one way: "Daemon" and "Freedom"

http://thedaemon.com/daemontech.html
“Daemon does for surfing the Web what Jaws did for swimming in the ocean.” — Chicago Sun-Times

Scary in completly different way: "Kill Decision"

“Kill Decision is a fantastic techno-thriller. As someone who has designed combat robots, I found the technology depicted both accurate and chilling.” — Alexander Rose - Executive Director & Roboticist, The Long Now Foundation