I'm still looking through this, but thought it might be of interest to some of you. I found it on The National Criminal Justice Reference Service website.
From the introduction:
"Our task was to identify and analyze the scientific and professional social science literature pertaining to the psychological and/or behavioral dimensions of terrorist behavior (not on victimization or effects). Our objectives were to explore what questions pertaining to terrorist groups and behavior had been asked by social science researchers; to identify the main findings from that research; and attempt to distill and summarize them within a framework of operationally relevant questions."
Psychology of Terrorism, Randy Borum
http://www.ncjrs.gov/pdffiles1/nij/grants/208551.pdf