Foodspotting - Focuses on specific dishes with user generated recommendations.
Touchnote - Send real postcards using cell photos.
iMuseum - A web tracker that searches via GPS the closest museums in your immediate area. Updates museum news and exhibition info regularly.
TripAdvisor - Honest reviews of hotels, restaurants, attractions, and more.
Yelp - Find places to eat, shop, drink, relax, and play and read reviews from knowledgable locals.
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.
Perfect World Clock - Provides easy access to the time in hundreds of cities adding several clocks as home screen widgets.
Google Goggles - Search by taking a picture. Users can point their cell phone cameras at paintings, famous landmarks, barcodes or QR products, or popular images. If Goggle finds it in its database, useful information will be returned.
RoadAhead - Find the best exit ahead on the highway to meet your travel needs.
myLanguage Translator Pro - Translate text into spoken voice.
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.
TravelSafe - A database of emergency service and embassy phone numbers for almost every country.
Seatguru - Shows the best seats on every plane and where power ports are located.
The Weather Channel - View current weather, hourly, 36 hour and 10 days forecasts.  Will forecast weather throughout the United States.
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.