This might be old news to some but i got this in my email inbox from Apple"
"Tune up for the world's largest running event ever!
Play music and get real-time data and voice feedback on your progress while you train and race with the Nike + iPod Sport Kit. After the race, upload your data from your sport kit to nikeplus.com to compare your results with other runners from around the globe. And check out armbands and headphones designed with running in mind."
So i checked out the website, its so cool! Basically its talking about Nike+. Nike has brought out these new shoes, and you put their sensor in you shoe. Then you can have the nike+ armband which gathers data from the sensor on how far you run, how many calories you burn etc. Then you detach the sensor, which is actually a USB, and plug it into your computer to upload your run!
Or instead of the armband you can have a sensor that plugs into your ipod nano. It will store your run data like the armband will and you plug the nano into your computer and upload the data.
lookie!
http://nikeplus.nike.com/nikeplus/index.jhtml
Sorry if this is all old hat to you, but i thought it was pretty neat!