We've seen quite a few prototype fuel-cell powered mobile devices, but Samsung's upping the ante by predicting that we'll all be running our phones on water by 2010. The company says it's developed a method to generate hydrogen by exposing water to metal, but the details are a little shaky -- we're guessing it's similar to the system used in the HydroPak generator, but it's hard to tell. Still, we've got no reason to doubt Samsung's engineers, who say the system currently provides about 10 hours of use, or about five days of average cell usage, and will eventually allow users to simply top off and go. That's every traveler's dream -- let's get this to market, Sammy.

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