GIS Data

VA:
http://www.virginiaplaces.org/boundaries/gisdata.html
http://gisdata.virginia.gov/Portal/

MD:
http://www.marylandgis.net/SHAdata/

MA:
http://www.mass.gov/mgis/laylist.htm

Other regions:
http://seamless.usgs.gov/
http://arcdata.esri.com/data/tiger2000/tiger_download.cfm
http://data.geocomm.com/catalog/index.html
http://www.nationalatlas.gov/atlasftp.html
http://gisdata.virginia.gov/Portal/

Scripts for ESRI software:
http://arcscripts.esri.com/

Freeware (Forestry GIS)
http://www.forestpal.com/fgis.html