Using Siri with VoiceOver
Being able to use VoiceOver and Siri together is an awesome feature. If you have ever tried to type using VoiceOver you know how tedious and time consuming creating a short text message can be. Now on the iPhone 4S, you can tap the microphone icon in the keyboard, tap your screen once with one finger to begin dictating to Siri. Double-tap the screen with two fingers to stop dictating to Siri and have your text appear in a message or search box.
Let me know any other cool features with Siri or iOS 5 that you have discovered.