This US-CERT (United States Computer Emergency Readiness Team) webpage offers links to four products in the National Cyber Awareness System: Alerts, Current Activity, Bulletins, and Tips. Each offers "a variety of information for users with varied technical expertise. Those with more technical interest can read the Alerts, Current Activity, or Bulletins. Users looking for more general-interest pieces can read the tips." The Current Activity link "provides up-to-date information about high-impact types of security activity affecting the community at large." The Alerts "provide timely information about current security issues, vulnerabilities, and exploits." The Bulletins "provide weekly summaries of new vulnerabilities. Patch information is provided when available." Finally, the Tips "provide advice about common security issues for the general public."
United States Computer Emergency Readiness Team: http://www.us-cert.gov/