Say that you are a librarian up in the stacks and the Circulation staff down at the desk needs to get a hold of you. If you had your iPad and they had one too (or an iPhone 4, a new iPod Touch or a Wi-Fi enabled Mac notebook computer), they could use the FaceTime app to call you you could answer their question essentially face to face. You could point the iPad camera at your own visage or you could use one on the front of the iPad to broadcast your view. This video-calling program comes standard on the iPad2. It can be purchased from the iTunes store for $.99.
The Internet Book of Life 