Though I don't know that I'd use it, this is a very cool integration between the iPod and a Nike running shoe.
Basically, you buy the special shoes and adapter kit and your "running" information is wirelessly transmited to an iPod.
Imagine dating advice "on demand" based on your emotional state. You wear a special device that monitors your perspiration and heart rate. Then, David D. (shameless promotion) provides you with sage pick up advice.
Low heart rate = "Dude, you're a chick magnet. Go over there and use your magic."
High heart rate = "Dude, she's out of your league. Splash some cold water on yourself."