NewsFactor has a story today that puts to the test the claims of a recent white paper (PDF link) from McAfee that warned Mac OS X could be the next Windows.
To the article's enormous credit, it also takes the conspiracy theory out of the discussion of McAfee's release. They're not trying to discredit OS X for the gain of Windows – they're trying to sell anti-virus software to Mac owners.
When some actual attacks happen, maybe it will become a problem. Until that time, there are a few, largely unexploited software flaws, most of them in Safari, that Apple is patching. I've still never heard from a switcher friend of mine that the malware on his or her Mac is driving them back to Windows...