An article on ZDNet that states that Snow Leopard has anti-malware built into it
(thanks Dee-Ann):
http://blogs.zdnet.com/security/?p=4104&tag=nl.e589
Side note: I wonder whether or not they read the EULA for their pre-released software? I realize that release date is really just a few days from now, but come on guys… Just wait a couple of days to post these things…