I have used those sites and have also found Ray Wenderlich's tutorials very useful.
http://www.raywenderlich.com/352/how-to-make-a-simple-iphone-game-with-cocos2d-tutorial
Also there are several references available here too:
http://www.cocos2d-iphone.org/wiki/doku.php/resources:iphone_recommended_reading
Happy coding! B)
ADDITION:
I found these two questions have many great resources too:
https://gamedev.stackexchange.com/q/2326/1037
https://gamedev.stackexchange.com/q/20/1037