TripAdvisor - Honest reviews of hotels, restaurants, attractions, and more.
EHU - Helps campers and caravanners keep track of the electrical output of their assorted travel gadgets to avoid overloading the circuit.
EveryTrail - Track, share and explore.  Plot your trip, photos, and video right on the map and upload it to EveryTrail, Facebook, and Twitter.
Groupon - Find 50% to 70% off restaurant offers.
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.
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.
World Clock - Time Zones - provides easy access to the time in hundreds of cities and adding several clock as home screen widgets.
Packing Pro - Enter destination, length of trip and who with and it will provide a list of what you may need.
Ski & Snow Report - Get the latest ski reports with detailed trail maps.
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.
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.
Yelp - Find places to eat, shop, drink, relax, and play and read reviews from knowledgable locals.
Tipulator - Makes tipping easy even with split bills.
Seatguru - Shows the best seats on every plane and where power ports are located.