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.
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.
Knapsack - Plan your trip and later share memories.
myLanguage Translator Pro - Translate text into spoken voice.
EveryTrail - Track, share and explore.  Plot your trip, photos, and video right on the map and upload it to EveryTrail, Facebook, and Twitter.
Air Sharing - Turns your iPhone into a wireless hard drive, allowing the user to quickly load documents at the airport that can be viewed in flight.
FlightTrack - Follow international flights with detailed information on departure gates, delays, and cancellations.
Waze - Provides user submitted traffic report to offer the fastest route for current road conditions.
Tipulator - Makes tipping easy even with split bills.
Google Wallet - Send money from anywhere to a friend in the US who has an email address.  Store loyalty programs in Google Wallet and leave the plastic cards behind.
Lemon Wallet - Allows user to store a digital copy of all cards – ID, insurance, loyalty, and payment card, so that they can be accessed whenever needed.
World Clock - Time Zones - provides easy access to the time in hundreds of cities and adding several clock as home screen widgets.
Tripit - Combine all your travel reservations in a single locations.
Urbanspoon - Shake your phone and the Urbanspoon slot machine will suggest local popular east via the GPS in your phone throughout the US, Canada, UK, and Australia.
Ski & Snow Report - Get the latest ski reports with detailed trail maps.