You've probably visited WebMD to answer your health questions. And the iTunes App Store already offers over 200 medicine-related apps, like information on drugs and heart-rate monitoring devices. But two new devices for the new iPhone OS demonstrate just how the iPhone is going to make monitoring your health both more immediate and interactive. One app can control a blood-pressure cuff that plugs in to your iPhone, and Johnson & Johnson revealed a similar app and device that tests blood glucose levels.

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