Two of these keys are all that stood between us and thermonuclear destruction at the height of the Cold War. I saw an image of one of these actual keys and thought it would be a great project to learn a bit of 3D modelling AND try out shapeways.com, an online vendor for 3D printing. After a few hours in a 3D program I had a decent model. I uploaded it to shapeways and 2 weeks later my launch key was in my mailbox. The resulting key was printed and cast in solid Sterling Silver.
You can order on of these in other (cheaper) materials in my Shapeways Shop.