This is an interesting one. Let's say an uncle sends you a $20 Starbucks gift card for your birthday, but you can't stand the taste of coffee or the sound of "adult alternative" music. Instead of having 20 bucks, you're stuck with a useless piece of plastic, unless you can find someone who will buy it from you.
The good news is that you don't have to stand outside Starbucks scalping your gift card. There are perfectly legal Web sites like CardCash and Cardpool where you can buy and sell gift cards. No, you won't get face value for your card, but both sites pay up to 92 percent of the total value. And they'll send you the money in one or two days after receiving your card in the mail. Internet to the recue!