Virtual, substitute, one time credit cards: what do you think of them?

George, After reading your column on the 'teeth whitener' scam, I think you should write a piece letting people know about using '1 time use' credit card numbers for internet purchases. Personally, I have a Citibank credit card that allows me to generate a unique credit card number for each purchase. The beauty of these is that they can only be used one time (no recurring charges) and I can set a dollar and time limit on them. If your reader had used one of these, he could have set up a $2 l