We have complained in the past that Microsoft does not make enough of the synergies between their various platforms. That may be a thing of the past, if this app is anything to go by.
Ubisoft has released a companion app for the Kinect game Your Shape: Fitness Evolved. While the app does not feature direct Xbox/Kinect integration, it does make use of the data uploaded by the game to the Ubisoft website, and can even be used without having the Kinect game.
The app is free and can be found in Marketplace here.
Thanks Xin for the tip.