I would recommend any short story collections by Philip K. Dick, they're a good entry point into Dick's mobius strip of a mind.
There are also some fantastic cyberpunk short stories out there. Check out Burning Chrome and Mirrorshades, they feature some of the best works from William Gibson and Bruce Sterling. Also you might check out Neal Stephenson's Snow Crash, maybe the best novel ever to feature pizza delivery ninjas.
some probably less known but still very good books imho: I've soaked up and enjoyed all of them..
- The Sten Cronicles by Chris Bunch and Allan Cole
- The Lost Fleet Series by Jack Campbell (John G. Hemry)
- Antares trilogy (Dawn, Passage and Victory) by Michael McCollum