AlpineQuest GPS Hiking - Comprehensive orienteering maps come complete with contour lines.
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.
PhotoSynth - Enables users to take awe inspiring panoramic pictures in an instant and is fully integrated with Facebook.
Google Translate - Translates user’s words as they are spoken into a device’s mic. Has a database of 50 languages.
myLanguage Translator Pro - Translate text into spoken voice.
JetLag Genie - Gradually alter your sleep habits before a trip to better deal with jet lag.
HearPlanet - The world’s largest audio guide pulls information from Wikipedia and its own database. Similar to audio guides handed out at museums.
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.
Tripit - Combine all your travel reservations in a single locations.
RoadNinja - Always know what is coming up at the next exit and compare gas prices at upcoming exits.
Packing Pro - Enter destination, length of trip and who with and it will provide a list of what you may need.
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.
iMuseum - A web tracker that searches via GPS the closest museums in your immediate area. Updates museum news and exhibition info regularly.
Yelp - Find places to eat, shop, drink, relax, and play and read reviews from knowledgable locals.
TravelSafe - A database of emergency service and embassy phone numbers for almost every country.