Cynergy has developed serveral iPhone and iPad applications. Development is done using Objective C which ensures faster execution and native code.
The applications we have developed so far rely heavily on web technologies and we use technologies such as JSON and soap to pull in dynamic data.
For a sample of one of the applications, take a look at the FotoPlanet application on the App Store.
We would be happy to quote you for any requirement you may have involving iPhone and iPad application development.