Courtesy of the Norwegian Defence Research Establishment:

Hanna Rogan: "JIHADISM ONLINE - A study of how al-Qaida and radikal Islamist groups use the Internet for terrorist purpose" FFI/REPORT-2006/00915

Brynjar Lia: "Al-Qaeda online: understanding jihadist internet infrastructure". JANE'S INTELLIGENCE REVIEW - dec 02, 2005

From the NEFA Foundation:
Evan Kohlmann's Irhaby007 Expert Report, January 2008
Irhaby007's American Connections, July 9, 2007