Other resources

Dead Art (2007): Real Screen | IMDb
      Ten 30-minute episodes showcasing stories and incredible art found in cemeteries in Paris, London, New York City, New Orleans, Hollywood, Prague, Mexico City, Sleepy Hollow (New York) and Boston.

The Association for Gravestone Studies

Find a Grave

Some Flickr groups
      Cemeteries & Graveyards & Tombs
      Graves, Tombs, & Cemeteries
      Visitors of Cemeteries
      Graveyard

On DeviantArt
      Gravewalkers    

On Facebook
      New England Cemeteries