Sony said today that is working to add native MP3 support to its portable music players. “The shift from reliance on its proprietary Atrac format will begin with flash memory-based players, but plans are still being finalized on how and when products will add MP3 support,” reports CNET News.com. “Sony is revisiting its MP3 strategy at a time when competition in the digital music market is heating up–and threatening to leave the company behind. The surprise move could portend a major strategy reversal for the consumer electronics giant, with important ramifications for the fledgling online music market.”