This week, around 18,000 video game developers, journalists, critics, and insiders descended on San Francisco for the 22nd annual Game Developers Conference. It's an educational forum (and chance for industry folk to rub shoulders), but it's often also the setting for big announcements and breakthroughs in game design.
Which got MSNBC thinking: What are the most significant video game developments? You know, the truly innovative game-changing – stuff? These are the top 5 - with one honorable mention.