The Dept. of Homeland Security has published the 2009 National Infrastructure Protection Plan (188 page pdf) The 2009 Plan replaces the 2006 version and reflects changes and updates to program elements and concepts. According to the DHS website, the Plan "provides the unifying structure for the integration of a wide range of efforts for the enhanced protection and resiliency of the nation's critical infrastructure and key resources (CIKR) into a single national program.
The overarching goal of the NIPP is to build a safer, more secure, and more resilient America by preventing, deterring, neutralizing, or mitigating the effects of deliberate efforts by terrorists to destroy, incapacitate, or exploit elements of our nation's CIKR and to strengthen national preparedness, timely response, and rapid recovery of CIKR in the event of an attack, natural disaster, or other emergency."
It was developed "collaboratively with CIKR partners in all levels of government and the private sector." There is much discussion of cyber security, since " DHS is also a focal point for the security of cyberspace."