PaperPulse is like Photoshop for Interactive Paper
With the aid of a conductive ink printer cartridge, this revolutionary software lets you to fashion and print interactive designs on your home printer. By adding some electronic components such as LEDs, buttons and other microcontrollers, voilá, a new form of creating circuitry at home. The paper printed circuitry has all sorts of potential applications in interaction design, from smart packaging to, say that special birthday postcard.
(via Fast Company Design)