2 years ago, this question was posted here at Gillies's blog, on date of 2009-05-15. Future for geospatial on App Engine? At that time there was no news relating to any apps of GIS web services ...
Ok, likely my bad for not making it to WhereCamp5280 and asking the FortiusOne geeks directly, but what's the process for creating GeoJSON 'tiles' for use in Polymaps? The Population example over at ...
Is there an existing library for converting ArcGIS IFeature types to and from Json/GeoJson?