eSecurity Planet 
A resource for daily information on e-security targeted to IT managers. The site provides users with information from a variety of sources, including experts at security product and services firms, and the consultants who follow the security industry.

CERT home page
This site hosts the CERT Coordination Center, an organization that focuses on computer security concerns for Internet users. Their home page contains information about the organization, links to an FTP site where CERT advisories can be retrieved, FAQs, archives, and research information.

Distributed Denial of Service Attacks and the Zombie Ant Effect
The recent spate of DDoS attacks made victims not only of their Web site targets but also of the computers that hackers mind-controlled into making the attacks.

Does Your PC Harbor Zombies Waiting to Attack?
Unprotected broadband connections can leave your PC open to raids by malicious hackers.