How to check balance on a gift card? Yogurtland?

There are several companies that buy and sell gift cards and some will let you check the balance through their website. Here is an article with more information: http://www.squidoo.com/unwanted-gift-cards

Yogurtland Gift Card

there's usually a phone number on the back of the card that will tell you the balance of the gift card. But if you don't have the card or you don't know which store it's for you may just be out of luck.