Is there any book on Google App Engine for java?
I would like to start using **Google App Engine for java**. But i don't know, where to start.  
Is the tutorial provided by google [ http://code.google.com/appengine/docs/java/overview.html ] enough ?   
Also, please mention some good books on GAE [ java ] so that i can <strike> download those from rapidshare or torrent</strike> buy those books and start reading them.
Is there any book on Google App Engine for java?
===

I would like to start using **Google App Engine for java**. But i don't know, where to start.  
Is the tutorial provided by google [ http://code.google.com/appengine/docs/java/overview.html ] enough ?   
Also, please mention some good books on GAE [ java ] so that i can <strike> download those from rapidshare or torrent</strike> buy those books and start reading them.