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If you include peripherals like Bluetooth headsets, then "wearable computing" is a boom. Of course, there a lot more misses than hits, just like in any other industry, sport, lottery, or lightning storm.

Cell phones started out as mostly single-purpose devices, and they evolved into handheld computers that can do almost anything. I think wearable computing will probably succeed better as single-purpose devices like the FitBit. Google Glass tries to do too much too soon. It might gain traction faster if it were just the equivalent of a Bluetooth headset for your eyes.