SpaceCraft 3D (free)
NASA's Spacecraft 3D is an augmented reality (AR) application that lets you learn about and interact with a variety of spacecraft that are used to explore our solar system, study Earth, and observe the universe. Using a printed AR Target and the camera on your mobile device, you can get up close with these robotic explorers and see how they move.

https://itunes.apple.com/gb/app/spacecraft-3d/id541089908?mt=8

iPod Touch, iPhone, iPad

Word Lens (free but you in app purchase language packs)

Fire it at a sign in a different language and it translates it to English for you.
http://itunes.apple.com/gb/app/word-lens/id383463868?mt=8

iPod Touch, iPhone, iPad

Chordmaster LE (free)

Use this app to remind you where to put your fingers when you are learning to play guitar. It plays the chord too.

http://itunes.apple.com/gb/app/chordmaster-le/id327084284?mt=8

iPod Touch, iPhone and iPad

Bill Atkinson Photocard Postcard (free)
Use the app to create and make postcards via email.

http://itunes.apple.com/gb/app/bill-atkinson-photocard-postcards/id333208430?mt=8


iPod Touch, iPhone and iPad

Voice Dictation 

You talk. It types. Send to other applications. Great for those who find writing a chore. You have to talk very clearly and it has some trouble with my strong accents.http://itunes.apple.com/gb/app/voice-dictation-voice-to-sms/id492594590?mt=8

iPod touch, iPad, iPhone  

Math Bingo Mental arithmetic game.You can add a few individual names and change the operation.http://itunes.apple.com/gb/app/math-bingo/id371338715?mt=8

iPod Touch, iPhone and iPad 

Motion Math

Although you can't set the starting level I like that this app to teach where fractions belong on a number line. If you get it wrong in gives you increasingly more helpful clues- and it helps with less than, greater than. It has lots of levels.http://itunes.apple.com/gb/app/motion-math/id392489333?mt=8

iPod Touch, iPhone and iPad