The following came in a mail to me. While the authenticity of this is questionable, it does indeed raise more interesting questions and highlights the myriad ways in which inventions can go above and beyond what they were originally intended for :)
Keep a watch out for people standing near you in the checkout line at retail stores, restaurants, grocery stores, etc who have a camera cell phone in hand. With the camera cell phones, they can take a picture of your credit card, which gives them your name, number, and expiration date.
And, as they always say, take care ! For more information on credit card related issues, read my earlier post "Why I don't (like to) flash my credit card too much".