First, let’s quickly re-visit the technology. Sensors, barcodes and RFID tags are all emerging methods of connecting real-world objects to the Internet. As I explained in my keynote presentation at the Mobile Summit, modern smart phones are increasingly being used to read and write this data. Smart phones can be used as both readers (e.g. barcode scanning) and writers (e.g. swiping your phone over an RFID Reader to purchase a subway ticket). Sensor technology is one of the most intriguing areas of innovation currently in smart phones. Firstly, the phone may read and act on sensor data from real world objects; data like temperature, noise and activity. Secondly, the phone may be used as a sensor itself; for example enabling other phone-toting people to sense your proximity to them.