There are several approaches to do geographical queries on App Engine:

http://code.google.com/p/geodatastore/
http://code.google.com/p/geomodel/
http://code.google.com/p/mutiny/

I would like to announce yet another project to work with geographical
point entities:

http://code.google.com/p/geotiles/

Frequently, it is required to fetch all important points for a given
area, similar to Google Buzz for Mobiles where only some number of
buzzes are shown for a given zoom. With this module, models
representing Mercator map tiles are populated with important points
starting from some maximum zoom to smaller ones. Importance of a point
may be population of a city, freshness of an update etc.

This is a very early alpha version and your feedback would be greatly
appreciated.

On a related note. Making a demo run on appspot.com would take the
last quota for applications. Is there a way to increase this quota?

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