I've always thought this to be an extremely interesting feature, the ability to interchange online gaming experiences between Windows games and the console based games for the XBOX 360 (provided you've got a Gold subscription). More concretely, one can play online regardless of the platform. The current games supporting this is surprisingly small, though, which pretty much nullifies the effect. I'd expected a more spectacular launch/marketing of this (actually) killer-feature for both Vista and XBOX360. Pity.