smarterplanet:

Participatory Sensing - An Interview with Deborah Estrin - O’Reilly Radar

The iPhone is a rich portable computer with onboard sensors. Specifically, it is a location-aware (GPS), motion-aware (accelerometer), directionally-aware (digital compass) visually aware (camera being used to scan QA codes or serve as visual input), sonically aware (microphone and speakers), always-connected (wireless or 3Gs) handheld computer. Every operative word in that sentence is deeply meaningful and rich with possibilities we have just begun to explore. The iPhone does a whole lot more than display information. It is an environmental sensor. Its value lies just as much in sensing information as it does in displaying information.