Examples of application, used Android Backup Services Do you know any Android applications (with open source, if it's possible), which use Android Backup Service (http://developer.android.com/guide/topics/data/backup.html)

I need examples, how Backup Service can be used in real applications.
In your Google account Dashboard view, in the Andoid device part you can see which applications stored someting in the Android backup service, for my account, beside the standard Android Wallpaper, Android System Settings and Android Market I have some "Dragon, Fly! Free" data (a game).