First of All, I did search the forums for similar posts before posting this and i still came away confused. I have a few questions reguarding nike+ and iPhone 4. 1) I'm interested in Nike+ and want it to record all my running data while also being able to listen to my music on my i4, what do i need to buy in order to make this happen? 2) Do i need the Nike+ shoes in order to have my data recorded? 3) Are there any places which sell Nike+ compatible shoes for cheap? 4) Where are some fairly cheap and reliable sites or places i could find the necessary materials for Nike+? Also is there anything else you think i might need to know? Thanks in Advance to everyone who answers.