Good news for people that like to move around: There's two free Kinect game demos up on Xbox Live today: Dance Central 2 and Kinect Sports: Season Two. In the latter you can try out both Golf and Tennis for yourself, using its full body motion tracking and in-game voice controls.
In Golf you can ask your caddy for clubs, or put your hand to your forehead to get an overview of the course. The Tennis demo supports two players.
Kinect Sports: Season Two will be released on October 25.