The NYS GIS Coordinating Body promotes and facilitates the development, effective use, and sharing of geographic information. This is a fine resource for locating GIS data, orthophotos, and educational material within the State of New York.
Recent additions to the portal include:
2004 orthophotos for 7 counties now available
2004 real property data
ALIS road center line data
Digital orthophoto application
See http://www.nysgis.state.ny.us/ Direct download of NY imagery is also provided at http://www.nysgis.state.ny.us/gateway/mg/nysdop_download.htm