I'm suprised that no one has mentioned Tron. Granted, it's old, dated, and has different mechanics, but it's among the prime inspirations (Or inspired by) many different cyberpunk books, movies, etc. It's shows you how some of the Matrix could look, and how everything needs permissions, and the world is abstracted. Plus the MCP could act like a punk of an AI (Cough, Deus, Cough). . . .