Google is such a fascinating example of a company that changed the game on the software industry giant Microsoft with it's business model of advertising. Who better to share that than Don Dodge who was originally at Microsoft and then joined Google.
Check out this recent article in the the New York Times: Google Apps Challenging Microsoft in Business
I also asked him to cover the battle royale for power in the mobile world with Android vs iOS where the stakes are even higher and the battleground is even more complicated with Carriers. And while one might argue who is winning or will ultimately prevail, it's very clear either way that the Business Model has as much to do with the fight as the technology.