Nike + iPod Sport Kit

This tiny runner's aid measures your pace from inside a specially designed shoe. Data streams to your iPod Nano which keeps time and calculates caloric burn. Select a distance or time for your workout (plus music) and a voice prompts you at intervals and when you're done you dock and upload the data and track your performance. Set goals for yourself or challenge others. Battery lasts about 1,000 hours -- that's an hour a day for nearly three years.

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