The list of commands recognized by Siri gets longer with every major iOS update. Many of the best features of Siri can easily be overlooked or forgotten. One thing Siri can assist with is checking up on new messages and email. This is especially helpful in a hands-free situation such as driving.
When it comes to email, simply activate Siri by holding the home button and say "read my email." New messages will appear and Siri will begin to read everything out loud. By everything, that means the date, sender, receiver and all text within the message body. While this can be tedious, it beats taking your eyes off the road.