Citibank recently revealed that thousands of customers’ PIN numbers had been obtained by scam artists and that it had to freeze PIN-based transactions for customers in Canada, Russia and the UK and then reissue cards to those customers.  They also apparently didn’t inform their customers about what was going on.  And now it looks like they aren’t the only bank dealing with what one expert calls "the worst hack ever."  Finally, if you used your debit/check card at Sam’s Club or OfficeMax you might want to check with your card company since it looks like the leak might have occured there.