If you have been looking to enhance the controls of your game to utilize the gyroscope for more accurate, or enhanced controls Rod Strougo has posted a tutorial featuring how to use Apple’s CoreMotion with Cocos2D.
The tutorial goes through the basics of adding the Core Motion framework to a Cocos2D project, and demonstrates how to obtain the pitch, roll, and yaw from the gyroscope.
You can find the tutorial here:
Getting Started With Core Motion In Cocos2D
If you are looking to get a grasp on exactly what the pitch roll, and yaw numbers mean there is a good free app showing those details available on iTunes here.
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