The Home Depot has left a message on it's site to alert customers about the possibility their system may have been hacked. What the company hasn't outright said is that your credit information has been stolen. Many credit cards are already being sold online. Since this isn't the first store to have been hacked, we should know some of this by now, but it needs repeating. Change your passwords on your accounts. Since this invasion is possibly greater than the Target mess, it would probably be wise to cancel or freeze your card. And, don't forget credit monitoring.