Features:

• Compatibility: iPod nano 1G, 2G, 3G
• Transforms your iPod nano into a personal workout coach--nano can provide real-time, spoken feedback that alerts you to workout milestones
• Lets your iPod nano track your running time, distance, pace, and calories burned
• Sync your iPod nano to transfer your workout data to iTunes and nikeplus.com for your performance history and more
• Kit includes wireless sensor for Nike+ shoes and wireless receiver for iPod nano

Editor Reviews:

Product Description:
The Nike + iPod Sport Kit lets you tailor your running experience for the ultimate workout. Just put the sensor into a special pocket in the Nike + iPod midsole, then plug a receiver into the Dock connector on youriPod Nano. The sensor&receiver give you instant feedback on your performance, through the iPod and its screen. You'll be able to track distance, time, pace and calories burned. You can also set up PowerSongs access the tunes that get you pumped instantly. It's everything you need to manage your workout AND enjoy it more.

Rating : - Great product and easy to use!!
I was a little nervous about being able to use the product and how well it would work since i didn't have the nike+ shoes, but so far, it seems to be very accurate and very easy to use.