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This has amazing implications for education and training. Layar is a free application on your mobile phone which shows what is around you by displaying real time digital information on top of reality through the camera of your mobile phone. Layar is available for the T-Mobile G1, HTC Magic and other Android phones in Android Market for the Netherlands. Other countries will be added later. Planned roll-out dates for other countries are not known yet.

So what happens when most of the residents of planet Earth carry a device that gives them instant access to pretty much all of the world's information? The implications-for politics, for education, for global economics-are dizzying. In theory, the mobile revolution could enable citizens to demand greater openness and accountability from their governments. The reverse might also be true: governments could more easily spy on citizens. "You also have the prospect of having 5 billion surveillance points," says Jonathan Zittrain, codirector of Harvard's Berkman Center for Internet & Society.