The switch to iPad apps and other mobile reading apps has taken away from News Corp's newspaper sales, Rupert Murdoch's son and Asian/European operations lead James Murdoch observed today at the Monaco Media Forum. He explained that they were "much more directly cannibalistic" than the web since subscribers often read and treated them like the traditional format rather where web users read differently. The executive wouldn't give sales numbers, but these included both the Wall Street Journal app as well as News of the World and the Times of London.