http://www.appleinsider.com/articles/09/11/03/exclusive_look_at_apples_new_ipod_touch_based_easypay_checkout.html http://www.appleinsider.com/articles/09/11/03/

http://www.appleinsider.com/articles/09/11/03/exclusive_look_at_apples_new_ipod_touch_based_easypay_checkout.html http://www.appleinsider.com/articles/09/11/03/exclusive_look... is what Apple's using. A bit clunky due to small manufacturing runs (no ability to super-shrink and amortize expensive R&D over millions of copies).