If you enhance your workout with the new Nike + iPod Sport Kit, you may be making yourself a surveillance target. A report from four University of Washington researchers to be released Thursday reveals that security flaws in the new RFID-powered device from Nike and Apple make it easy for tech-savvy stalkers, thieves and corporations to track your movements. With just a few hundred dollars and a little know-how, someone could even plot your running routes on a Google map without your knowledge.