Wind-powered light for cars is useless, but has fins
Slapping the "Car Decorative Wind Power LED Lamp" on your vehicle will net you two things: an increase of glowing red and blue lights, certain to fool only the most rheumy-eyed driver that you're a tiny, whistling cop; and a sure decrease in the resale value (not to mention drag efficiency) of your car. It's $5, plus $5 shipping. It's horrible, of course, but has a certain something, if only because it reminds me of those sorely missed fins and wings of Jet Age automobiles.
Car Decorative Wind Power LED Lamp catalog page [SourcingMap.com via Red Ferret]

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Thanks to some asshole car thief, my car's resale value is negligable. At $5 a pop, it might be cheap enough to literally cover my car in these, though red ones wouldn't work. Wanna see a Civic that gets 13 MPG?
They need to make car bodies that look like that.
I suggest people get the real thing instead. Cars need more rocket hood ornaments.
Isn't it illegal in most places to have red and blue lights on the top of your car unless you're an emergency vehicle?
I have an intense desire to put some of these on a red bicycle!
Unfortunately if you dissect these I'll bet that instead of a clever little generator you find a couple of button cells and a wind operated switch,like most of this kind of craptastic stuff.
I think Dan Dare had an input to the design of these - cool they ain't!
I'm thinking one of these may be just what my otherwise mundane bicycle helmet as been craving.