This just a quick performance/accuracy test of the HandTrackingLib provided by FORTH. The test was done by just running the demo that you can download here: http://cvrlcode.ics.forth.gr/handtracking/
The first thing we noticed is that optimum tracking depth range seems to be quite narrow, as you can notice at the calibration process before the tracking starts (you have to match the initial pose quite well).
The second one is that the modest specs of the hardware used heavily affect the effectiveness of the tracking, probably because the time that it takes to make the calculations some frames get lost, thus making bigger differences/distance between consecutive analysed frames.
The library is available in the OpenNI middleware section, unfortunately only for the 2.0 version of OpenNI's library, that only works with licensed SDK devices (Asus Xtion and Kinect for Windows, but not regular XBox Kinect).
We will try to make it work modifying the provided examples, feeding the tracking library with data from freenect, and letting it use OpenNI 2.0 just for the calculations.
You can get more info about the library here: http://www.ics.forth.gr/~argyros/research/kinecthandtracking.htm