VirusList.com
Permanently replenishing information about new viruses. Mechanisms of breeding and operation, detailed analysis of algorithms of viruses. Methods to guard against computer viruses.
http://www.viruslist.com

Hidden Killers--Deadly Viruses
Basics about viruses, our bodies' immune systems, information about specific viruses, and how these 'hidden killers' could potentially be used as bio-weapons. There are also weekly/bi-weekly feature articles on various facets that involve viruses.
http://library.thinkquest.org/23054/gather/index.shtml

Personal Home Page - Szor, Peter
Research papers on computer viruses written by Peter Szor. The site covers Windows viruses and worms and the development of polymorphic and metamorphic viruses.
http://www.peterszor.com/

Norton AntiVirus for Macintosh
This antivirus utility from Symantec Corporation gives you unparalleled protection that's safe and easy to use. Use it against viruses in Internet downloads, email attachments, CDs, floppy disks, shared files, and networks. It detects and removes all known viruses, plus unknown and unidentified macro viruses.
http://www.symantec.com/nav/nav_mac/

davebauer.net - Avoiding Viruses
Joomla! - the dynamic portal engine and content management system
http://www.davebauer.net/avoiding_viruses.asp

VirusBarrier
Intego VirusBarrier X4: the acclaimed antivirus program for the Mac
http://www.intego.com/virusbarrier/

RAV AntiVirus Desktop
RAV Antivirus Website - Reliable AntiVirus Solutions, AntiVirus Research, Statistics
http://www.rav.ro/

International Committee on Taxonomy of Viruses
Taxonomy of viruses, including electron microscopy pictures, and family descriptions.
http://www.ncbi.nlm.nih.gov/ICTVdb/Images/

Animal Viruses
A basic guide to animal, plant, and bacterial viruses. Information on the structure and genetic material.
http://www.geocities.com/virusonlineinfo/

DrWeb Virenscanner
Free download of one of the leading antivirus software Dr.Web. Version for Windows XP, 2000, NT, 9x, ME, LINUX, FreeBSD, Solaris. It detects viruses and clean up your PC or filtred mails in your mailserver. Heuristic anylyse included. Includes the resident SpIDer program (monitor) and desktop scanner. Available in Russian, English, German, Spanish. Very short update period of virus databases.
http://www.drweb-online.de/index_e.htm