Here's a short quote:
Microsoft is investing a significant amount of resources into the entertainment side of Vista, and Games for Windows looks promising. Games for Windows is more than just a marketing campaign, it should add significant benefit to the PC and console gaming experience. Microsoft is pushing for an easier installation experience, Xbox controller compatibility, and a full inter-compatible console/pc communication system. These are just some of the awesome features that Microsoft is driving for, there are many more that I probably can’t discuss until they show up. Rest assured, Games for Windows is not hype and I think developers should take a serious look at it.