Studies Internet security vulnerabilities, provides incident response services to sites that have been the victims of attack, publishes a variety of security alerts, researches security and survivability in wide-area-networked computing, and develops info http://www.cert.org/
Provides a mechanism that allows citizens, businesses, and other institutions to communicate directly with the United States government regarding cyber security information. http://www.us-cert.gov/
SANS Internet Storm Center - A Cooperative cyber threat monitor and alert system. Featuring daily handler diaries with summarizing and analyzing new threats and events. http://isc.sans.org/
Non-profit enterprise whose mission is to help organizations reduce the risk of business and e-commerce disruptions resulting from inadequate technical security controls. http://www.cisecurity.org
University center for multidisciplinary research and education in areas of information security. Provides hotlist covering all aspects of security. http://www.cerias.purdue.edu/
CIAC publishes security bulletins and virus and hoax information. They provide computer security assistance to US Department of Energy (DOE) sites. http://www.ciac.org/ciac/index.html