Here’s how it works: First you buy a Starbucks gift card. Then you load up the free Starbucks Card Mobile app on your iPod Touch, iPhone, or BlackBerry (Starbucks says 71% of their customer base carries at least one of these), punch in the details from the gift card, and you’re all set. The barista scans a code of your device’s screen when it’s time to pay, and your daily dose of caffeine is one the way. When the funds run low, you can refill the card right from the handset. Pretty nifty.