I'm always looking for tools that make travel easier, or at least a little less frustrating. I heard about Gate Guru from a friend of mine and downloaded it to my iPhone. Gate Guru allows you to locate food, shopping, ATM machines, news stands, WiFi, etc in most of the major US airports. There are a couple of non-US airports such as Heathrow and Vancouver as well. It's a great tool to have at your disposal. It's recently been incorporated into the Kayak iPhone app as well, making Kayak an even better one stop shop.