Oliver Kreylos has found a way to use Microsoft's Kinect as a 3D web camera:
Yet another Kinect concept comes to the scene, being demoed on YouTube. Oliver Kreylos has developed a C++ implementation of Kinect that allows for 3D reconstruction of a room using a single Kinect system. This works by taking advantage of the photographic video stream that is seen by the camera, then merging that data with the depth video stream. The depth camera will create points that the software can interpret to help create a 3D image that one can move around.
The resulting product is an awesome live 3D "model" of a room and everything inside of it.