From firsthand experience, the PostGIS extension for PostgreSQL is fantastic. A couple of my coworkers at Basho have done geospatial work with Riak, our scalab

From firsthand experience, the PostGIS extension for PostgreSQL is fantastic. A couple of my coworkers at Basho have done geospatial work with Riak, our scalable, distributed database: http://basho.com/indexing-the-zombie-apocalypse-with-riak/ http://basho.com/indexing-the-zombie-apocalypse-with-riak/