Open Source Intelligence
Intelligence for national security purposes gathered from non-classified sources.
Proceedings from a 1992-7 conferences: http://www.oss.net/Proceedings
Oss Net (last "what's new" Jan'00): http://www.oss.net/ "sponsors an annual conference for intelligence professionals from all walks of life and all countries of the world", founded by Robert David Steele
Comprehensive guide to economic and open-source intelligence-related resources on the Web, as well as an overview of commercial intelligence enterprises.: http://www.fas.org/irp/wwwecon.html
A different (non-military) spin comes from Open Flows.
There's a Yahoo OSINT group run by The Intelligence Network (http://www.intellnet.org/). Around 50 msgs/day. There are others: terrorism, spynews, ampm, InTheShadows, Israels-Challenge... all hosted on Yahoo Groups.
a 2006 conference http://www.echochamberproject.com/osint