Dineoutcheap - Gives diners a fast and easy way to find deals.
HearPlanet - The world’s largest audio guide pulls information from Wikipedia and its own database. Similar to audio guides handed out at museums.
ExpertFlyer - Get notified when seats become available.
Zagat - A guide to discovering the best restaurants, bars, cafes and clubs.  Started with nine cities (Austin, Boston, Chicago, London, Los Angeles, New York, Philadelphia, San Francisco, Washington DC) with more on the way.
Google Translate - Translates user’s words as they are spoken into a device’s mic. Has a database of 50 languages.
Hailo - Uses cell phone’s GPS to make cabs come to the user.   Available in six US cities/15 worldwide.
mTrip - Provides travel guides around the world, offline maps & navigations, personalized itineraries of visits, and trip journal and sharing.
The Weather Channel - View current weather, hourly, 36 hour and 10 days forecasts.  Will forecast weather throughout the United States.
iMovie - Provides best option to shoot and send videos back home. Soundtracks and shot transitions can be dragged and dropped to create movie postcards.
Passbook - Passbook is an application in Apple’s iOS that allows users to store coupons, boarding passes, event tickets, store cards, generic cards, and other forms of mobile payment.
BestParking - Steers drivers toward the cheapest and most convenient garages and lots in 100 cities and 115 airports throughout North America.
Trip Journal - This virtual travel scrapbook will also create maps of your various explorations as long as your GPS in turned on, geo tagged with pictures, videos, and notes.
TravelSafe - A database of emergency service and embassy phone numbers for almost every country.
Groupon - Find 50% to 70% off restaurant offers.
Touchnote - Send real postcards using cell photos.