Published earlier this year by USIP, Suicide Bombers in Iraq: The Strategy and Ideology of Martyrdom, should be put on the deployment reading list.

I'm usually a bit leery when approaching books that have been heavily publicized like this one - with its own website and a USIP "event" held early in July - but it is well worth cover price.
Table of Contents

Part I: Insurgents and Their Strategies
1. Nationalists and Baathists
2. The Jihadi Salafis
3. Suicide Terrorism in the Iraqi Insurgency

Part II: The Alchemy of Martyrdom: Ideology, Theology and Mythology of Suicide Terrorism
4. The Ideology and Theology of Martyrdom
5. Martyrdom Mythology in Iraq

Part III: Martyrs Without Borders: Transnational Networks and Volunteerism in Iraq
6. Arab Fighters in Iraq
7. European Muslims in Iraq
8. Implications for Theory and Policy
Fully sourced, illustrated with plenty of charts, graphs and network diagrams, along with useful appendices, I found the book to be perhaps the best unclass piece on the subject matter I've read to date.