Do You Think Mac OS X Needs Anti-Virus Software?

As you probably know, the BBC and a bunch of publications pounced over a "new" Tech Support Note recommending the use of anti-virus software, accusing Apple of "quietly" changing their tune about the Mac being virus-proof. We discovered this was false. Then Apple removed the notes, saying they were obsolete because Mac OS X is designed with built-in protection. Certainly, Mac OS X's architecture and their out-of-the-box security policies make their OS safer than Windows. Or does it? Despite the technical arguments, do you think Mac OS X needs anti-virus software?