It looks like you’ll soon be able to buy stuff off the PlayStation Store with a gift card. The PlayStation Network card is making its way around to select journalists/writers/deadbeats, a possible indication that they’ll be released to the general public soon. The cards are useful for crazy people who are afriad of using their credit card online (such as my uncle) or for kids whose parents won’t let them use their credit card (such as my father back in the day).
When, exactly, they’ll be in stores is unknown. Soon, though, you’d have to think.