This site offers links to a variety of great resources. There is image and vector data available for download. Items include orthophotos and USGS topo quad maps in the free download section. Options for vector data includes; single tiles, tiled by town, tiled by USGS quad, tiled by orthophoto quad, tiled by basin, tiled by watershed, and tiled by soils survey area. Orthophotos are in color and black and white.