The Apple Store is already way more efficient than shopping in most other stores -- there are usually dozens of clerks walking around with handheld card readers, so you never have to wait in a long line for a cash register.
But sometimes the store gets so crowded, it's hard even to find a clerk to check you out.
That's where the Apple Store App comes in. It was released last week for the iPhone 4 and 4S, and lets you buy small items like chargers, cases, or packaged software without ever talking to a single person in the store.
I discovered it this morning on a visit to the Apple Store in downtown San Francisco, where I was buying a replacement charger for my Macbook.
The clerk was having trouble getting my battered credit card to register. So he asked me if I had an iPhone 4.