According to some estimates, 75% of all viruses today are macro viruses. Once a macro virus gets onto your machine, it can embed itself in all future documents you create with the application. Antivirus programs can protect your system against most macro viruses, although new ones are always being created that slip by the antivirus filters.

Hartmann's In-The-Wild Macro Virus List
Describes macro viruses reported by anti-virus software manufacturers.

A Computer Virus Primer
If you are one of the millions of computer users surfing the Internet, you need to be aware of the threat and protect yourself accordingly.

Word Macro Virus FAQ
Microsoft FAQ with answers to questions about Word macro viruses.