Are you wanting to learn JDO because you're interested in JDO in
particular, or are you wanting to learn it just for GAE? If the latter,
I'm wondering if you might be interested in other APIs that might be a bit
better suited for GAE.
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There aren't any books on JDO2+ AFAIK. Best place to learn about it
are
Apache JDO, who manage the API : http://db.apache.org/jdo/
DataNucleus docs (all pages under JDO API menu) :
http://www.datanucleus.org/products/accessplatform_3_0/jdo/api.html
JDO spec (linked from the above two places).
