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.
Computer Retrovirus Aims for Microsoft
The new Blaster worm is quite similar to a retrovirus in that its function is to attack the immune system -- in this case, Microsoft's Windows Update site -- the only site from which the patch for blocking Blaster can be downloaded.
McAfee virus information home page
McAfee Associates specializes in network and security management. This page displays company news and product information, as well as links to virus descriptions and online technical support.
Open Networks Today
Networking news moves at a fast pace, and Open Networks Today lets you keep up with it. Open Networks Today offers its readers the ability to control how news is presented through customizing content filters, discussions, and news feed links.
Webopedia's "Did You Know?" Article
The Difference Between a Virus, Worm and Trojan Horse.
