mTrip - Provides travel guides around the world, offline maps & navigations, personalized itineraries of visits, and trip journal and sharing.
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.
HopStop - Offers public transport information on 68 of the world’s biggest, busiest metropolitan hubs.
Groupon - Find 50% to 70% off restaurant offers.
Hailo - Uses cell phone’s GPS to make cabs come to the user.   Available in six US cities/15 worldwide.
Dineoutcheap - Gives diners a fast and easy way to find deals.
Schemer - Google’s test crowd sourced travel guide.  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.
HearPlanet - The world’s largest audio guide pulls information from Wikipedia and its own database. Similar to audio guides handed out at museums.
Knapsack - Plan your trip and later share memories.
TripAdvisor - Honest reviews of hotels, restaurants, attractions, and more.
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.
Seatguru - Shows the best seats on every plane and where power ports are located.
RoadAhead - Find the best exit ahead on the highway to meet your travel needs.
Foodspotting - Focuses on specific dishes with user generated recommendations.
Opentable - Reserve tables and earn rewards at over 20,000 U.S. restaurants.