AusCERT - Australia's National CERT

The security internet standards. 

Center for Education and Research in Information Assurance and Security. University center for multidisciplinary research and education in areas of information security.

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-net ...

CIAC publishes security bulletins and virus and hoax information. They provide computer security assistance to US Department of Energy (DOE) sites.

eVuln.com - Penetration Tests and Security Advisories List

Our security bulletin is compiled from multiple leading sources and condensed to reduce your efforts in reviewing them regularly.

Internet Security Systems' X-Force organization delivers the latest information on Internet threats and vulnerabilities through three complementary online publications.

Linux-Security Group, server administration, technical support and remote administration for dedicated servers, colocation servers, Apache web servers, e-mail servers, FTP file servers, and complete network-Internet se ...

A software vendor that provides their own online security assessment. Good for home users.