I just wanted to share with you that I’ve just published an extension that allows you to easily integrate the AdMob SDK into your Android cocos2d-x applications. It was about time for me to give something back to the community.
The source code is released under the MIT license and can be found on the following Google Code project page: https://code.google.com/p/cocos2d-x-admob/
I also wrote a step-by-step integration guide on my blog: http://rastergrid.com/blog/2013/03/admob-extension-for-cocos2d-x-android/
It currently supports only Android, but has also a Win32 stub implementation that can be used for development purposes.
In case you have any questions, improvement ideas, patches or ports to other platforms feel free to contact me.
Thanks for your great work on cocos2d-x and I hope you’ll find my extension useful.