FlightTrack Pro – Live Flight Status Tracker by Mobiata With FlightTrack Pro it is possible to check all details of your flight number of gate, flight status, etc. You will be notified if you are delayed.

TripIt - Travel Organizer (no ads) Store your travel details on-line. You don't need to have your travel information printed. The app is connected with your e-mail and will put all details into an organized itinerary.

AroundMe Using your location it shows you many things around (nearest gas station, restaurants, places of interest). It has GPS driving instuctions which are very useful.

Yelp If you are in a new city, this app is very useful. It gives you users reviews for many places, photos and ratings. Which restaurant has free Wi-Fi, what kind of food they provide, etc.

Urbanspoon A good app to select a place to eat. With the iPhone app you can book restaurant recervations.