This is an improved but unofficial API Reference for Cocos2D (for iOS) hosted on the Learn & Master Cocos2D website.
CCDirectorIOS, CCDirectorMac, CCArray, CCLayer, EAGLView, CCKeyboardEventDelegate & CCMouseEventDelegate, CCProfiler, CCScheduler, probably others too ...
Some of these classes are well documented but just not included in the official docs. Few classes like CCProfiler are entirely undocumented but at least you see the methods these classes expose, and that the class exists.
There's also a new Modules Tab to make some documented C code more accessible, like CGPointExtension and CCDrawingPrimitives.
The programming guide is hosted here: http://www.cocos2d-iphone.org/wiki/doku.php/prog_guide:index