You definitely need anti-virus software on the Macintosh.
That way you can download stuff on a Macintosh that you want to use on a PC; you do the virus check on the Macintosh without the slightest chance of catching anything. Then pass the checked stuff on to the PC.
On a PC, there is always the risk that some virus is more clever than the antivirus software and you catch something.
Seriously, the viruses that Symantec has found are so absolutely lame that you have to be completely braindamaged to catch anything. Like download the virus, then enter your admin password to allow it to infect your machine. At the moment there is nothing on MacOS X that would require a virus checker.
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You definitely need anti-virus software on the Macintosh. That way you can download stuff on a Macintosh that you want to use on a PC; you do the virus check on the Macintosh without the slightest chance of catching anything. Then pass the checked stuff on to the PC. On a PC, there is always the risk that some virus is more clever than the antivirus software and you catch something. Seriously, the viruses that Symantec has found are so absolutely lame that you have to be completely braindamaged to catch anything. Like download the virus, then enter your admin password to allow it to infect your machine. At the moment there is nothing on MacOS X that would require a virus checker.