Hey, i just found this site when doing some research (and looking for some johnny lee stuff).  I had orginally used johnny lees library (which is awesome by the way) to use the wiimote to integrate headtracking into video games (i.e fps games).  after getting it working using his library i had problems that i needed to get away from using the wiimote  and bluetooth directly and decided to see if i could take the IR camera out of the wiimote and connect it to a microcontroller that could use Xbee (zigbee).  This is in fact very doable if you are comfortable with soldering and building your own simple board (i am).

newest video after building my own circuit (fez mini, xbee and special i2c circuit for wiimote ir cam):
<a href="http://www.youtube.com/watch?v=eug_EbyTeFM" target="_blank">http://www.youtube.com/watch?v=eug_EbyTeFM</a>

first try with johnny lee library (in COD black ops):
<a href="http://www.youtube.com/watch?v=mEOa1TXq9zI" target="_blank">http://www.youtube.com/watch?v=mEOa1TXq9zI</a>

more info, circuit designs, and pics on my site:
http://contractorwolf.wordpress.com

Thanks again Johnny Lee! your TED talk was the inspiration for this project!

send me a note here on on my site if you want to know more