I'm currently attending a Working Group on Afghanistan Village Stability Operations (VSO).
This site was talked about numerous of times by USSOCOM J2 and RAND reps in attendence.
http://www.tribalanalysiscenter.com/Home.html
Now this site is mainly for Afghanistan, but it will cover most of the world tribal systems. All you have to do I think is just request a paper from them off .MIL or .SMIL email
For you going to Afghanistan here is a great Reference Material on Afghanistan
http://www.tribalanalysiscenter.com/...erial%201.html
or here
http://www.tribalanalysiscenter.com/...Completed.html
Something worked for you post on it and state how it helped you out.