Just blogged over at kindohm.com:

"I've created an implementation of a Kinect NUI Trackball which can be used for manipulating a camera around WPF 3D scenes. This "HandsTrackball" is adapted from the Trackball class included in the source code for WPF 3DTools. The original Trackball class allows you to use the mouse to rotate around a WPF 3D scene."

Read the entire post here: http://kindohm.com/2011/07/05/WPF3DManipulationWithKinect.html