Japan leads the world on bad-ass novelty business-cards, so it's no surprise that they've got access to CO2 lasers that print your contact details on peanut shells.
Taberu Me cards are created using Arigatou’s high-grade CO2 laser engraver nicknamed “Shiawase-kun,” which can etch up to 700 characters per second on hard organic materials like beans, nuts, rice and pasta and which has been optimized to print clean-looking logos, names and telephone numbers on the irregular surfaces of peanut shells.
See also:
Business-card punch-out cutlery
Business card that sprouts
Business-card converts to set of lockpicks
Cutlery made out of potato starch
Cutlery with wrenches on the end
Anti-terror cutlery for airline security theater
Moo Cards: Stunning kid-sized custom biz-cards with Flickr pix