We have Wikipedia and Linux, but as location-based services take off, where's the "free as in speech" street-level map of the world? OpenStreetMap has it, and 250,000 people are already contributing.The obvious question was "why bother?" Terrific maps from Google, Microsoft, and others already had a significant lead and are free...
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OpenStreetMap: Crowd-Sourcing the World, A street at a Time