PositionGames.com has released their B737 Cockpit interactive Panels package for FSX. The add-on is developed for iPad, iPhone and iPod touch. It gives you the flexibility to use your device as a second screen. You can choose from 6 different Cockpit panels. Those panels bidirectional, which means they are controllable and have a direct communication to FSX. Every change you make in FSX will be displayed on your device and every button you press or dial you turn, will be redirected to FSX. There six carefully rendered panels are:
Free Client to interface with FSX from HERE
You can download the App from PositionGames.com B737 Interactive cockpit Homepage.