http://www.amazon.co.uk/Crystal-Global-Trading-Company-Flashlight/dp/B00067I75C/ref=pd_bbs_3/203-5646646-3540749?ie=UTF8&s=electronics&qid=1189978498&sr=8-3

Yes. Kinetic Energy----> Chemical Energy ----> Fuels the batteries.

Same concept as the hand-crank radio.

Possible, yes. Good? Maybe not. Here's a review: http://the-gadgeteer.com/review/forever_led_flashlight_review.

They're not too bad. I got a couple as a gift a couple of years ago. "Shakelight" brand but basically identical to the picture in the link. Not overly bright, but on the other hand you're never out of batteries. My dad has a three led recharged by a crank instead of by shaking. That one is really good. I think the brand name was "Nebo".

Umm very clever its surprising that it can work, cheers for the info.

I keep one in my car at all times.
It's great for emergencies.