From within a customers account on Amazon.co.uk if you have a lot of payment methods listed under the same person the only way to tell them apart is the '<card> ending in xxxx' string. Although this suffices, it is not easy to know which payment method you are using without having all cards to hand to check against.
It would simplify user experience if an alias could be added to a card, such as 'credit card' or 'savings account' etc.