Podcasting move over, say hello to Roadcasting
Roadcasting is a system that allows anyone to have their own radio station, broadcasted among cars in an ad-hoc network. It plays the songs that people want to hear and it transforms car radio into an interactive medium. Source code here! via unmediated
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They have a video, on the bottom of the page, that explains the concept really well. Sounds like good stuff to me.