Communication Middleware for Monitoring Financial Critical Infrastructure
-- U.S. Plans Cyber Shield for Critical Infrastructure --
A recent article from the WSJ about U.S. plans for monitoring Critical infrastructures (CI). It highlights the value of collaborative approaches to identifying threats in distributed systems.

http://online.wsj.com/article/SB10001424052748704545004575352983850463108.html?mod=WSJ_hpp_MIDDLETopStories

From the article:
'The federal government is launching an expansive program dubbed "Perfect Citizen" to detect cyber assaults on private companies and government agencies running such critical infrastructure as the electricity grid and nuclear-power plants'

A follow-up article on Wired:
http://www.wired.com/threatlevel/2010/07/nsa-2/

We're doing some similar work in the CoMiFin project to protect Financial CI. Our system facilitates information exchange between participants with distributed event processing for identifying emerging threats.