Reverse engineer. Blogger. Investor. Photographer Hiker. Kayaker.

Now when you’re visiting an Apple Retail Store and you already have an iOS device (iPhone, iPad, iPod touch) in your pocket with [the Apple Store app](http://itunes.apple.com/us/app/apple-store/id375380948?mt=8) installed you can scan the barcodes of the items you want to purchase, pay with a credit card, and walk right out of the store.

This is excellent.