This card holder and coin purse is on the top of my 'gadget' wishlist.
They're by a French company Ogon Designs, website is here.
They are designed so that the aluminium case protects the magnetic strips from demagnetization and also from theft of personal data that can be stolen by radio scanners.
I think the coin dispenser is pretty cool too, but its only for Euro's :( see it in action here
I saw the card holder in a shop window when I was lost in London the other day...
May go back and try and find that shop again!