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What's better than Twitter in the city? An iPhone. With a connection to the Internet, built-in camera, location-awareness, 3-access accelerometer and colorful display, the Apple iPhone has become much more than a mobile phone: it's a sophisticated mobile computing platform. Combine this technology with a library of thousands of programs and growing ecosystem of developers, the iPhone is powerful and versatile tool to transform how people interact with their surroundings.
A growing number of iPhone apps are taking advantage of the phone's functionality to allow people to navigate, measure, observe, and interact with cities in new ways. This post describes some I have come across for e-government, urban sensing and interaction, and navigation. First, a caveat: I don't actually own one of the devices myself and haven't tested the apps (yet). I've certainly missed many, so leave your favorites in the comments below.