I did say most didn't I. But software that specializes is a different breed, with their platforms depending largely on what their business users are running. If all the businesses in a particular industry are running Windows, then what financial gain is there from making the tool cross platform? None whatsoever
... However, when you move out to more generalized software for the average consumer (i.e. productivity, graphics, entertainment, etc., essentially what the story submitter was originally polling), then the landscape changes. More Mac users means more financial incentive for companies to make their "can't-do-without apps" cross platform.