We confess we haven't given this card a user-test. (Too many cards are bad for one's credit report.) But it's hard not to love the idea. A kidney-shaped credit card that snaps into a carrying case keychain. Fiscal independence doesn't have to look so square, or even so rectangular. As a marketing ploy to lure in design-susceptible college teens it's pure evil genius as well. There are other cool-looking cards out there, but none so out there as Discover's.