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While playing around with the iPhone beta OS 3.0 and iTunes 8.2, Sfreddo Marco sutmbled upon some hidden settings that revealed Nike+ tab and settings on iTunes. Nike+iPod is already official (on iPod Touch 2G), but it seems that iTunes 8.2 with your new iPhone 3.0 will give you detailed tracking of your workout via nikeplus.com.
The leaked screenshots over at modmyi show details of ‘last workout / workout history’ and also gives an option to push that data to your online account over at NikePlus. Also, mention of a sensor seems to be present. While raises speculations about external sensors to better track our workout or connect to accessories.