IMac - OS X a-v sugestions/links please...

A friend has a new IMac - Mac OS X and I don't know what a-v options she ought to be considering, or even if there isn't something that might have come with the package...
I know very little about using Mac products.

Suggestions and/or links to Mac security related sites/forums, please.

TIA...

There isn't one that comes with the package, however she should look at the "usual suspects"......Norton and McAfee. They both have Mac versions.