I am a bit confused on the Nike+ gadgets. If I purchase a Nike+ shoe at the store, does it come with the sensor or do I still need to purchase it separately? I know you can purchase the sensor and attach it to any shoe, just curious if the Nike+ shoes for 75 bucks has the sensor built-in or is it just a regular shoe with a "special slot"? Question about the accuracy. I have in the past bought and frankly received free Pedometers and found them to lack any accuracy. For the most part the ones I have tested required you to enter the number of steps you take over a given period and just calculates the total via the number of minutes you walk or run. Is the Nike+ the same way? If not, how does it actually retrieve the stats? I don't believe it has a GPS sensor, so it could not figure it out my location, or am I completely off scale? Is it worth purchasing in general? The cost is not concerning as it is only 20 bucks, again more based on accuracy and rather or not after the initial purchase, do people still use it? Oh yeah, I have the 2nd Gen IPOD touch. Thanks for any comments.