Would it be too risky to mention Bill Gates' "The Path to the Future" at a hacker community? Bill Gates mainly discussed about the social impact of techniques including multimedia and Internet. I re-read the book yesterday and still find interesting insights.
At the same time, I enjoy reading "The Art of Unix programming" and "Just for fun". Both books reveal that why some open source code can live more than tens of years, because they are created by enthusiasm and fun.