In reply to mypyrex:
Not a headtorch but I do have a wind up radio for camping. BUSH brand from Argos, it was about a tenner. 1 min winding gives 20 mins of radio. It also has a torch built in and the leads and adaptors to charge popular mobile phones. It can take batteries as well presumably for when you can't be arsed to wind the thing up! I think it was a good buy. I digress, I have seen wind up headtorch's but personally I'd be far happier with my Tikka and the spare batteries I carry in the first aid pouch. The technology seems to be getting better/cheaper though...