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I came across http://www.k-tor.com/pedal-powered-generator/ which allows you to pedal and generate power and plug in things (laptop, phone, etc).
If this device had a better design (light/easy to move but also sturdy) and maybe integrated into a system like Fitbit (social competition, who generated the most power, etc.) and maybe was $99 rather than $195 - ... so Would you buy it?