OpenStreetMap: Massachusetts
OpenStreetMap display of Massachusetts. (This will soon enter the main OSM caches — I’m just impatient.)
Thanks to Brandon Martin-Anderson, one of MetaCarta Labs’s new minions, who helped me get started by writing MassGIS shapefile -> OSM file converters, and to all the great people who have made the OSM Server and code so much more usable since the last time I tried to do this.