Have you seen them traser glowrings? Keyrings that glow in the dark not powered by light -like illuminous paint. They are powered with some kind of radioactive gas in a tiny glass tube that glows for about 10 years. What I'd like to know is why hasn't someone thought of sticking these glowsticks in self-adhesive cases that could be stuck in a whole array of usefull places, for example: light switches (see them in the dark), doorlocks on the home and the car - no more fumbling in the...

I've noticed led lights popping up in all forms nowadays. The latest I've seen is one that fits onto your usb port on a computer and makes a handy night light for your keyboard. Not my idea obviously but, how about one that fits in your phone socket utilising the free power source of the phone line. You could have it on a bulldog type clip and use it to illuminate your phone ot your notepad by phone. I'd buy one for a few quid.

A simple device that sits between dog collar and lead, that when pulled beyond a pre set tension, emits a high pitched whistle that dog hears but you can't. Annoys your dog so much he stops pulling, or rather 'gently reminds' your pooch when he pulls too much (got to beat a kick up the jacksy). I suppose construction would be like those scales that fishermen use. Amazingly simple to make and cheap to sell. I'd pay a fiver for one anyway.