hi list!
maybe this is interesting for people working or planing to work with the kinect and pd/gem.
i finished a documentation about the kinect pd/gem externals (pix_freenect, pix_openni, pix_threshold_depth, pix_depth2rgba, freenect, freenect_audio) it deals with general properties of the sensor and describes the externals and their usage in various applications.
you can get the pdf document here: http://iem.kug.ac.at/fileadmin/media/iem/projects/2012/kronlachner_01.pdf
software and examples can be found at my github repo: https://github.com/kronihias/
have fun matthias