Hi Robert,
   First, let me thank you for your answer not just to this question,
but for others I've not asked. You always provide great insights, and
very well written comments.
   re: you post below.
   My suspicions confirmed about using List properties in this manner.
   I wish there was a good summary page of all the "performance
gotchas" somewhere. There are quite a few of them -- not because GAE
is necessarily bad, but due more so to its non-standard architecture.
Cheers,
Steve

>   I favor the third approach over the second because it gives you a
> bunch of flexibility.  You can serialize your entities how ever you
> want to;  I frequently use JSON.  In several instances I have found
> ListProperties to have very poor performance characteristics, even
> when they are not indexed.  With your third technique you can wait to
> deserialize the additional data, unless / until it is needed.

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