American Express has recently introduced Butterfly, for Gold Card holders. The Butterfly card is a foldable credit card that comes in a tiny case. It is completely free and linked back to the main Gold Card account of the Amex holder. The "signature accessory" is intended to give some cache to carrying a Gold Card, but it is also a way to minimize what you carry. American Express points out that it can be used as an accessory or key ring, as a chain or loop can be easily attached to it. It looks much more stylish than just about all other keychain credit cards.
[via Cool Hunting]