• Download Chris Schmidt's branch of FS from http://svn.crschmidt.net/personal/featurserver_appengine, which comes with a geohash implementation written by Schuyler as an AppEngine? DataSource?. Place this somewhere (eg /myapp)
• Put a copy of http://geomodel.googlecode.com/svn/trunk/geo/ under a folder called "geo" under /myapp
• We also need FeatureServer? itself .. so let's just throw it in there. Delete /myapp/.svn and checkout svn http://svn.featureserver.org/trunk/featureserver/ to that same folder.
• If you prefer GeoModel? over Geohash, edit one line of fs.py so it looks like

  from FeatureServer.DataSource.AppEngineGeoModel import AppEngineGeoModel as AppEngine