Speak and Translate
The free edition of Speak and Translate will only utilize Microsoft's translation server for conversions (you can access Google's superior service after paying), auto-translate 7 words using the "Language auto-recognition" feature, and run the real-time "live dialog" feature 5 times before you will have to pony up $4 for the Pro version. [Free - Pro]
Instead of speaking into your phone, handing it over for the other party to listen and reply, and then having it returned, AirTranslate allows each party to pair their respective mobile devices. What's more, iTranslate offers a translation similar translation service for your email, SMS, Twitter or Facebook accounts. The app will cost you a whopping $2. [iTunes]
With a digital babel fish of your very own at your disposal, there won't be anywhere you can't travel to. Just be sure to bring a towel.
source: gizmodo.com by Andrew Tarantola