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A guy built a very clever radio - it uses a marker on an actual spinning globe to tune into radio stations over the web anywhere in the world. Want to change the station to another hemisphere? Easy - just rotate the orb to wherever you want to head and it will find an online radio feed there for you and play it.
He also gives instructions on how to build one, although I have to admit it's way beyond my expertise. Neat idea, though!
RadioGlobe - Spin to Search Over 2000 Web Radio Stations!