Cocos2d should have a prefix in class name.
For example: UI..., NS...,CG...,gl...
But the prefix should be:
cc > [ccNode node]; [ccAtlasSprite ...
CC > [CCNode node]; [CCAtlasSprite ...
I prefer CC in capital letters.
http://code.google.com/p/cocos2d-iphone/issues/detail?id=520