Apple has posted a new guided tour of the iPhone 3G that primarily rehashes previously announced features, but also fully demonstrates purchasing and downloading of applications from the App Store--a mechanism not seen in action heretofore.
The video shows an application being purchased via a "Buy Now" button in a fashion similar to the Wi-Fi music store. Once the application is purchased, the user is immediately returned to the home screen and an application icon with a progress bar appears. The user can (presumably) perform other actions while the application is being downloaded.
Posted from our sister site iPhone atlas.