Virus Problems of Potatoes
Photographs of symptoms and information on virus Y, leafroll virus, virus S, virus X, mop top virus, spraing, tobacco rattle virus, potato spindle tuber viroid and alfalfa mosaic virus.
http://vegetablemdonline.ppath.cornell.edu/NewsArticles/Potato_Virus.htm

F-Secure Virus Information Centre
F-Secure provides Security Software, Anti-Virus and Cryptography Centralized Policy Management, Wireless Security, Network Security, Virtual Private Networks
http://www.f-secure.com/v-descs/

Central Command, Inc.
Company markets Vexira Antivirus software as well as: virus protection consulting, implementation, and audit services. Free trial virus protection downloads and up-to-date virus information.
http://www.centralcommand.com/

HyperActive Software
Software development firm, specializing in Hypercard and related environments. Hypercard virus information, anti-virus software, Hypercard tutorials, and Hypercard success stories.
http://www.hyperactivesw.com

Declude Virus
Declude: Next generation mail server spam control and anti-virus software
http://www.declude.com/

Virus Chaser
Auto-updating anti-virus software developed by China Limited.
http://www.viruschaser.com.hk/eng/

HyperActive Software/HC Virus Definitions
HyperCard Virus Compendium
http://www.hyperactivesw.com/Virus1.html

Secunia - Virus Information
Secunia corporate information, Vulnerability database, Secunia Research, Binary Analysis, and Vulnerability Scanning tools
http://secunia.com/virus_information/

D and F Virus
Anti virus software and viruses (~100) for download.
http://web.tiscali.it/dec_spiderman

Understanding the Virus Threat and Developing Effective Anti-Virus Policy
This paper focuses on providing the reader with an overview of the current virus landscape and aids in developing best practice anti-virus policies. After presenting the threat, we'll introduce you to today's most popular anti-virus tools.
http://www.sans.org/rr/papers/index.php?id=135