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As a flight recorder: The white box becomes a "black box" thanks to one airplane customization company. That said, iPods aren't exactly known for their durability... I'm guessing this is more of a backup/convenience feature than a safety one.
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In cop cars: Police (and other folks) are figuring out how to use the iPod as a remote desktop tool. Just plug it in to another PC and have access to all your files just like you're sitting at your desk.
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On the cricket fields: Cricket pros in the UK are using the gadget to study videos of their opponents during matches.
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In Linux geek basements: I've seen reports of iPods running Linux for many months now, but now it's getting so sophisticated people are actually playing Doom on the things.
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In crime dens: That bit in Firewall where the bad guys load up bank records onto an iPod was a joke, but it's not far from the truth. Enterprising crooks have figured out that absconding with company secrets on their MP3 players attracts minimal attention.