Ok, who's got experience with online gaming gift cards? Club Penguin, Playdom, Zynga, whatever. Do the little cards at 7-11 really work? Or if there is trouble getting them to work, are customer service reps on hand? I refuse to put my credit card number into anything tied to a Facebook ap, but this would be cool I guess. Feedback on them anyone? http://www.mahalo.com/online-games-gift-cards