One of the things I’ve always wanted to do in my car (as I drive to and fro taking my kids to and from school, music lessons, and soccer practice) is to read my emails and text messages. But taking your eyes off the road is bad, mmmkay?
You can always turn on VoiceOver before you get in the car to read your screen to you, but it involves a whole lot of tapping and different gestures, so it’s kind of impractical to use on a non-regular basis.
Luckily, in iOS 7, you can now get Siri to read your email and your iMessages to you with a simple spoken command.