With the release of the iPhone 4S come Siri, the new voice commands on crack as I like to call them. With this feature you can hold down your home button and say a command to your iPhone. You can ask questions or command Siri to do something for you like a Google search. Other commands include setting a timer, alarm, writing email, text messages, calling, and much much more. Siri will type out anything you dictate to it, so if you're driving and can't type on your phone, just tell Siri what you want to do/say and you're done. You have to see this thing to believe really as it even gets used to your voice. The Siri feature is currently only available on the iPhone 4S and requires a 3G or Wifi connection.