"Crossing the Chasm: Marketing and Selling High-Tech Products to Mainstream Customers" by Geoffrey A. Moore and also his recent "Zone to win". His books explain some of the "deeper structure" to tech business, and is one of the few business-related books I've read that has any depth. By "depth", I mean in the sense that I'm used to from research mathematics (I'm a number theorist by training), where you learn something about a problem that lets you think about problems in a more detailed way.
Also recommended in this reply