This document discusses using MongoDB and Rails for geolocation and other NoSQL applications. It provides examples of geospatial indexing and querying in MongoDB and Mongoid. Some key points covered include: - Using MongoDB for its flexibility and support for geospatial indexing and queries. - Examples of near, within center, and within box queries in MongoDB and Mongoid. - Alternatives for geospatial support include Geohash, PostGIS, and SpatialLite. - The importance of just building applications without seeking approval.