The first post goes into details on how to use the Reachability class provided by Apple to detect network availability on iPhone and iPod touch.
The second post describes my first dive into augmented reality apps. In this particular case I give some information on how to integrate an OpenGL view managed by cocos2d with the UIImagePickerController. It details where you have to modify cocos2d code to make the OpenGL view transparent - which is a requirement in case you want to overlay the camera image with the OpenGL view.
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