As someone who travels a fair bit, I often have layovers at an airport while I wait for the next flight. Typically there is just enough time to get something to eat or buy something I need, but the time is tight enough that I need to be efficient in doing so. GateGuru is a very helpful app that lets you make the most of your time in the airport. It used to cost $1.99, but now it is free.
When you start the app, if you are at an airport the app quickly figures out where you are. Otherwise, you can jump the last airport at which you used the app or you can select from a list of airports.
Once you select an airport, the app allows you to select a particular terminal or concourse and then shows you all of the establishments at that concourse. You can filter the list to only display food options, shops or services. Each entry displays the name, category and location so you know where in the concourse to find the establishment.
You can tap on an entry to get more information such as reviews. I rarely find the reviews helpful, but sometimes they are, such as this review indicating that the particular restaurant is one of only two sit-down restaurants at the concourse.
In addition to limiting your search to a particular concourse, you also can search the entire airport. For example, let's say you are at the Atlanta airport (which has a great train making it easy to go from one terminal to another) and you feel like going to the Chick-fil-A. Where is it? GateGuru quickly tells you that it is on Concourse A, right next to Gate A10. Instead of wasting time looking for a directory in the airport and then looking over other peoples' heads as they also try to figure out where to go, you can just head straight to the A10 area.
I've done a lot of traveling over the last few months, and this app has been a big help. GateGuru makes it easy to quickly determine restaurant options or find a service, from an ATM to a shoeshine. I see that the app has several other features — for example, it allows you to add bookmarks, review establishments, suggest additional entries for the app — but I haven't used any of them. For me, the core function of the app, the ability to efficiently determine what is available at an airport, makes this a must-have iPhone app for the frequent or occasional traveler.
Click here to get GateGuru (free): 
