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I like where they are going with this. While they're at it, why not use this technology in every vibration dampening and force-arresting device in a car? Replace your seat belts, engine mounts, and struts with this technology and maybe you'll create enough spare juice to run an oven as you drive to work.

More realistically, they could add a thin lining of this stuff to a tire and use it to recharge the battery used to transmit tire pressure data to your car's computer.

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I agree with isnoop. Oh common guys why dont you use your common sense, to generate a predetermined power the person has to carry predetermined weight. Isnt that an extra burden? why cant they fix this PVDF in shoes or as isnoop suggested in cars? People had already thought about it before
http://web.media.mit.edu/~testarne/TR328/node8.html

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Some of those "thought of it before" examples are different - they take energy by damping what used to be a spring system that is largely energy neutral, so you end up working harder (eg. your shoes absorb the impact as before, but no-longer spring you back off the ground afterwards, so it's more like walking in sand) - no free lunch, etc. In contrast, the backpack concept has interesting potential because if done right, it can be damping mostly energy that was working against you (hindering you) due to inefficiencies of the walking motion, thus allowing a net gain in efficiency.
(Shock absorbers suck their energy right out of the gas tank, but currently they're just dumping all that energy you just purchased as heat, so dumping it as useable electricity instead would be a gain in efficiency if the savings could pay for the extra componentry).

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This would be great for something like the roof of the Denver International Airport. The force of the wind on such a massive suface could generate a significant amount of otherwise wasted energy.

http://www.flydenver.com/guide/sightsound/index.asp

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