Hi,
I have written this small article, and linked it from the wiki:
http://www.jesusbosch.com/2012/07/ios-game-development-handling-different.html
It was a confusing topic for me at the beginning, so I decided to share my experience to help other people. My experience with cocos is not big…, so if you think it has errors that need to be checked please let me know and I will correct it, I will really appreciate it 
Cheers,
JB