iPod has teamed with Nike to create a shoe that transmits distance and speed information to the iPod Nano. The data can then be transmitted to your computer. Another interesting feature is that a "power song" can be activated to help you pick up the pace.
"You don’t just take iPod nano on your run. You let it take you. Music is your motivation. But what if you want to go further? Thanks to a unique partnership between NIKE and Apple, your iPod nano becomes your coach. Your personal trainer. Your favourite workout companion. Introducing Nike iPod."