Chris says:

www.ipodnn.com/articles/08/04/25/nikeipod.gear.patent

Check this new patent from Nike:

"Future sensors may monitor many different factors, including EKG, heartrate, body temperature and even hydration. GPS data may also be present, enabling users to track exactly which routes they have taken."

 MadeUpName says:

you'd think that with all that wireless gadgetry going on they could sort out wireless headphones too!!!!

 Chris says:

Yes, you would think!!