Christian Spanning is a GIS professional urban planning technologist who builds applications for Boston Metropolitan Area Planning Council (MAPC)
He blogs a lot about Open Source GIS topics and demonstrates tricks of the trade. His blog contains examples of using OpenLayers, GeoExt,OpenStreetMap, Google Maps API, and MASS GIS web services. He is discusses happenings at GIS events, Open Data initiatives and other things in and around Cambridge and Boston.