1Snow Crash
Franchises line the Los Angeles freeway as far as the eye can see: Reverend Wayne's Pearly Gates, Mr. Lee's Greater Hong Kong, Uncle Enzo's CosaNostra Pizza, Incorporated. The only relief from the sea of logos is within the well-guarded borders of the autonomous city-states that law-abiding citizens are afraid to leave. Is it any wonder that most sane folks have chosen to live in a computer-generated universe? Here in virtual reality is a domain of pleasures limited only by imagination, where everyone is safe and free. But now a strange new computer virus called Snow Crash has invaded even this sanctuary, striking down hackers everywhere, leaving young Hiro Protagonist as humankind's last best hope.
In reality, Hiro delivers pizza for the CosaNostra. But in Metaverse, he's a freelance hacker and a warrior prince--the Deliverator, the greatest sword fighter in the world. Now he's racing along the neon-lit streets on a search-and-destroy mission, looking for the shadowy virtual villain threatening to bring about Infocalypse.
Co-Founder/Google
Brin said he is a big sci-fi fan, and Stephenson's acclaimed 1992 novel "Snow Crash" is one of his favorites. The book "was really 10 years ahead of its time," Brin said. "It kind of anticipated what's going to happen, and I find that really interesting." [source]
It's a tough call because I prefer other books of this author. But this book is so important within the history of science fiction. [source]
Partner/500 Startups
My list would be (besides the ones I mentioned in answer to the previous question) both business & Fiction/Sci-Fi and ones I personally found helpful to myself. The business books explain just exactly how business, work & investing are in reality & how to think properly & differentiate yourself. On the non-business side, a mix of History & classic fiction to understand people, philosophy to make sense of life and Science fiction to picture what the future could be like (not always utopian). [source]

