The iPad has already been very successful for the Wall Street Journal as an e-reader, News Corp's chief Rupert Murdoch said during a call discussing his company's latest results. About 64,000 are subscribing to the newspaper in just the first month; it's also significantly more profitable than the same subscription on the Kindle, he said. Unlike Amazon's insistence on a revenue split, the WSJ keeps all of the nearly $18 it costs for a month of reading.
