http://www.engadget.com/2007/10/29/next-gen-credit-cards-to-feature-miniature-displays-and-keypads/

As if there wasn't enough temptation to get into debt, credit card manufacturers are now looking to stick fancy displays and keypads directly onto cards. The "Credit Card Embedded Authentication Device" was put together by Innovative Card Technologies and eMue Technologies, and uses the screen and keypad to provide security for online and mobile based banking transfers: the user enters their pin into the card, which gives back a one-time use code to authorize online transactions. The card will get its "consumer debut" -- whatever that means -- in Paris this November, at the Cartes & IDentification event.

Source: engadge