Plugins:
http://docs.unity3d.com/Manual/Plugins.html
Roll-A-Ball:
http://unity3d.com/learn/tutorials/projects/roll-a-ball
http://unity3d.com/learn/tutorials/modules/beginner/platform-specific/accelerometer-input
Touch/Orbit Camera:
http://forum.unity3d.com/threads/touch-to-orbit-script.15181/
