I received this information via e-mail this morning. This is why I like to get holiday gift cards from my bank.
Crooks have found a way to rob you of your gift card balance. If you buy gift cards from a display rack that has various store cards, you may become a victim of theft. Crooks jot down the card numbers in the store and then wait a few days and call to see how much of a balance they have on the card. Once they find the card is "activated", they go online and start shopping. You may want to purchase your card(s) from the store's customer service window where the gift cards are not viewable by the public.
For more information on this scam, check out the information on Snopes.com.