For Tom Ward who designs electronic devices for a living, has all his traces concealed in the work he does. This not only makes him very much in demand, but also hard to get back to for repeat orders. That was only until Tom decided to put his skills to a much more marketable use. Tom wanted a card that not only reflected his skills, but also made a lasting impression. He made a unique business card that can actually be used to auto dial his phone number. Tom not only succeeded in making his card memorable, he went on one step further & posted a guide on how to make your own card.

Furthermore, while the prototype version wasn’t that cheap, he’s actually managed to get the price down to about $2 per card when producing large batches. At that price it’s not something you’d eventually want to hand out to everyone you came across, but if you’re trying to woo a particular client, it would make quite an impact.
Details at Instructables. Via – Ohgizmo