See 
http://groups.google.com/group/google-appengine/browse_thread/thread/a29a4b1dd606f52e
regarding the mcycle consumption impact of having lots of fields.

On Oct 16, 9:11 pm, David koblas <[EMAIL PROTECTED]> wrote:
> I'm storing application preferences in the datastore, they come in a
> variety of types.  As I see it I've got three choices for implementation:
>
>     * Name / Blob
>       -- "general" has a json encoded object of all of the sub-settings
>     * Name / ID / Lots of Fields
>       --  Where ID = "general" or "user" (etc.) and different fields in
>       each entity
>     * Name / ID / Key  / Value
>       -- Where you  query out all of the "user" settings and
>       re-construct an object from it.
>
> My gut feel is that #2 is preferable, since it avoids double encoding
> the data and doing a query out of a large number of records in the later
> case.
>
> Thanks,
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