http://www.youtube.com/watch?v=culnxT2pBpc
This is Virtual Instruments with Microsoft Kinect over the Internet. It's a project done by 11 students from Nanyang Technological University, Information Engineering and Media program.
The users are allowed to play virtual instruments with a Kinect and get connected with each other over the Internet. Virtual instruments created in this project include many different kinds, such as DJ mixer, Hawaiian style instruments and etc.. The entire project is started from scratch and make use of available open sources.
Please feel free and take a look. Your comments and feedbacks are appreciated.