Still no spyware, trojans, worms or virii.

So there's a potential for some trojans.... exactly how many exploits for OS X have been found in the wild? Umm.... there was Opener, but that's long since been shut down, and wasn't all that widespread anyway... so we're still looking at one or two in the six odd years of OS X. The Month of Apple Bugs mostly addressed third party vulnerabilities, and only a couple of Mac OS vulns, now shut.

True, a computer is only as secure as the user allows it to be, and Mac users do need to pay more attention. Dodging bullets for a few years is really only luck. Sooner or later something will come, but it's still a far cry from the entire industry that relies on Windows' security holes for revenue.