SecurityFocus.com is the perfect website to find any kinds of information and articles related to computer security issues.
The site is very well designed and presents a bunch of known issues articles for Microsoft O.S, Unix, and more. You have sections like bugtraq, vulnerabilities, mailing lists, jobs, tools and vista. There is also information about virus, pen-test, incidents, firewalls and lots of tips about how to really secure your operating system from almost any potential harm. You can also find the most updated news regarding hacking and security issues as well as antivirus software companies showing the latest vulnerabilities around. If you ever thought that your computer had security issues or there is a potential risk you definitely have to take a look at this site, SecurityFocus.com has the right tools to prevent almost any security issue. 
