EXTREMIST TRADITIONS IN ISLAMISMOut of happenstance I came across three links that give some historical background to different strands of Islamist thought for the general reader:
 " 
Kharijite Islam" at 
GlobalSecurity.org,  "
What's Worse than Violent Jihadists?" on Mahdism by 
Timothy Furnish at 
HNN and finally from an article originally in the 
ME Quarterly, " 
Fundamentalist Islam: The Drive for Power" by 
Martin Kramer ( though Kramer leaves out Muhammed Abduh's contribution, he does cover al-Afghani).