Credit card scams: protect yourself with one-time use credit cards

In the battle against less than honorable businesses, consumers have a weapon that many of us have overlooked -- the one-time use, or "virtual" credit cards. John O'Leary of West Hartford brought these cards to my attention last month after reading my column about Dazzle White, the teeth-whitening company that has sucked in thousands of people by offering dirt-cheap samples on the Internet, but then charging $59 a month until customers figure out how to cancel the charges. O'Leary said he has