Yesterday, we had a hackathon at Microsoft Japan using the Kinect For Windows sensor and SDK. It was fun to take the samples and try to create some fun and some serious applications using the Kinect.
One person created something to improve the efficiency of diet / excercise programs to make peoples lives better. On the less useful side, I extended a green screen program to place you on stage with your favorite rock stars. The program, working with the kinect sensors takes the background away and replaces it with a video. Then it uses the joint sensors to attach a guitar to your left hand.
Below is a picture of my daughter holding a virtual guitar and playing on stage with BABYMETAL, and my son playing with Guns N Roses. It was a lot of fun and super easy to do mashing together samples in the SDK.