Evernote - Take notes, capture photos, create to do lists, record voice reminders, and make these notes completely searchable. Users can combine and share travel notes.
Tipulator - Makes tipping easy even with split bills.
FlightTrack - Follow international flights with detailed information on departure gates, delays, and cancellations.
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.
AlpineQuest GPS Hiking - Comprehensive orienteering maps come complete with contour lines.
Ski & Snow Report - Get the latest ski reports with detailed trail maps.
EHU - Helps campers and caravanners keep track of the electrical output of their assorted travel gadgets to avoid overloading the circuit.
HearPlanet - The world’s largest audio guide pulls information from Wikipedia and its own database. Similar to audio guides handed out at museums.
Livingsocial - Find 50% off restaurant offers.
WhatsApp Messenger - Provides the ability to send data (including pictures, videos, sound clips, and GPS tags as well as text) via Wi-Fi for free to people anywhere in the world.
RoadNinja - Always know what is coming up at the next exit and compare gas prices at upcoming exits.
XE Currency - Quotes live currency rates.
iMovie - Provides best option to shoot and send videos back home. Soundtracks and shot transitions can be dragged and dropped to create movie postcards.
Schemer - Users leave recommendations for things to do in their city and visitors can add to a to do list and check off as they go.
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.