Este blog parece tener buenos ejemplos: 
 http://gae-java-persistence.blogspot.com/

Estos son otras referencias, lo mas seguro las has visto antes...

   - http://code.google.com/appengine/docs/java/datastore/jpa/overview.html
   - http://code.google.com/p/datanucleus-appengine/
   - 
   
http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/package-summary.html

Perdona que no te pueda informar mas, yo no uso JPA... yo uso el 
DatastoreService directamente.

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