Your newest and/or favorite travel app?

Trip Advisor's app has new offline features like maps and recent reviews.
The new Google Translate app has lots of new James Bond features like the ability to translate text via the camera feature in real time, and offline.

Wonderful! Thank you. Sounds like something I could use in Serbia!

I do use Booking.com and TripAdvisor.com extensively to research rooms.
MatrixITAsoftware.com is where I research flights worldwide.

And I use GoogleMaps and Mapquest to plot how far it is from place to place. I also magnify (++++) GoogleMaps to find accommodations where I want to stay in a locale.
Wikipedia is used all the time to research where I'm traveling to, and what airlines fly into and out of specific airports.

Here's the ones I use the most:

Flashlight App (because light is awesome)
TripIt (stores all your tickets, hotel confirmations in one convenient location)
Skype (much cheaper way to make phonecalls)
Skyscanner (flight search)
Google Translate (you can take a photo of a menu or other item in another language and it will translate it for you)

For my iPad, I love citymaps2go...which you can use offline (you only need to connect up when you first arrive in the city, then you can use it offline and it will pinpoint where you are...and I love to pin all the places I want to see in a city before hand and then I can make sure I don't miss something if we are in a certain neighbourhood).

For reading, I love Overdrive...I have my local libraries on there so I can download books for free, and Next Issue where I can read all the magazines I want to kill time on trains and planes. If you get a local pape at home, check and see if they have an online version - great to keep track of what is happening at home.

For before I go away, my packing list is on Packing Pro so I don't forget anything. While I'm on holiday, I have an expense app (it's just called spending on my ipad) so I can keep track of where are money is being spent.

I also love travelpod for keeping a day to day diary that I can share with my friends and family. I've used NoteLedge as sort of a pre-trip scrapbook - whereas before I would have carried a small notebook with things I printed and taped into the book, now I can just put things in my noteledge journal - like, well...notes about what to tentatively do each day, or cut and paste directions/maps from the internet and see them offline.

I'm using a navigation app Spyglass that supports different maps, depending on my current needs: google maps, apple maps, open street map and open cycle map. It's also very important that the app can read pre-downloaded maps when offline. Besides, it has many useful features for those people that are not very good at orienting. The app shows your current position on the map, can save waypoints and locations, for example, your car or your hotel location. You can check it here https://itunes.apple.com/app/spyglass/id332639548?mt=8&at=11lLc7&ct=c