OK gang, I'm gonna call you out on this.
1) There ARE MS Macro-language viruses that can and do infect Macs running MS Word and Excel. Because MS Office allows applications to run macros and executable scripts, it is entirely possible to exploit this cross-platform, non OS specific vector for viruses and worms.
2) To reply "I don't think so" and "Hah, not on a Mac" without checking out the real facts is irresponsible forum behaviour. If you don't
know, then shaddap. One day, the answer is going to be Yes it can be destructive on a Mac.
3) The real answer, from the Symantec
Anti Virus database on the Blackmal worm (which is what I assume the news clip was about) is that it is written in Visual Basic and uses Windows Media Player but Macs, DOS and Linux are not affected. Macs with Office have Visual Basic for Applications (VBA) and WMP, but not the full Visual Basic.
So it was potentially a threat, but did not prove to affect Macs.