Q: Is the book or its
drafts still available as PDF like during the ServerSide Review?
A: No, please order your hardcopy of the online at your favorite
retailer, see links on homepage.
Q: Is the
source-code of the examples in the book available for download on-line?
A: Yes, see download link on the homepage.
Q: Can you recommend a particular JDO vendor / implementation?
A: No, but the book has an appendix with an extensive overview of
the JDO vendor landscape at the time of writing. So buy the book! ;-)