
Here's an article from the New York Times about <A HREF="http://www.nytimes.com/2002/04/27/technology/27VIRU.html">W32/KLEZ.H</A>, a program that combines elements of a virus, which infects machines, and a worm, which transports itself from machine to machine. It also tries to disable some antivirus programs. Free registration is required to view this article.