MassGIS data contains pretty much any GIS dataset for Massachusettes that you could need. Conveniently organized by either raster of vector datasets you can spend hours here! ESRI Shapefiles, tiled by Town, USGS Quad, OQ Quad, Basin, Watershed, State, NE. See http://www.mass.gov/mgis/download.htm or http://www.mass.gov/mgis/ftpstate.htm