PowenKo, iOS ad, admob
reference: http://johntwang.com/blog/2009/06/08/how-to-use-google-apis-with-iphone-sdk/
iOS, Android, Unity3D Education blog,
reference: http://johntwang.com/blog/2009/06/08/how-to-use-google-apis-with-iphone-sdk/
sample code: tabnav4 reference: http://useyourloaf.com/blog/2010/11/27/iad-framework-updates-for-ios-42.html