> Why use the JDO/JPA?

You don't need to use those.

For appengine you need to use BigTable.

 JDO/JPA is one way to use BigTable.

There are others (that are easier to use but may not have the same portability):

http://code.google.com/p/objectify-appengine/
http://sites.google.com/site/slim3appengine/slim3-datastore
http://code.google.com/p/twig-persist/

Shawn

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