Nike + iPod Sport Kit is a running buddy in your shoes.

Runners needing a personal trainer but can't afford one, have a new convenient option thanks to two giant corporates, Nike and Apple. The two companies have combined two of their most popular products in creating the talking Nike + iPod Sport Kit. It's a regular iPod equipped with a Nike Sensor that can be fitted in a slot on a Nike + ready running shoe or in a pod holder instead. The sensor then collects and beams the data about your run, like distance covered, duration, calories burn, etc to an iPod Nano or Touch.
An interesting feature of the Nike + iPod is its ability to talk to you during your run to communicate to you all the above mentioned data or more, like the distance left to cover, a countdown till the end of the run etc. After the run, you can connect the iPod to a computer and upload your stats to iTunes or to Nikeplus.com where they are stored under your account. The Nikeplus site even let you create a running plan that you can share with friends or other runners in your area.

For more, NYTimes.com