My friend John Ballinger has submitted a heart monitor application for the iPhone to the iTunes App Store that lets you use the mic in the headphones or built in to the base of the phone to get an accurate heart rate.

iPhone App - Heart Monitor from John Ballinger on Vimeo.

This is extremely innovative and really starts to show the potential of the iPhone as a development platform. Nice one John, I hope you are an App Store Millionaire soon.

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