On our main map archive, our thought was to have a few directory levels, so URLs work out to: http://drndl.grassrootsmapping.org/<location>/<year-month-day-sitename>/<format>/<file>.<extension> resulting in: http://archive.publiclaboratory.org/cambridge/2011-6-22-massachusetts-cambridge-mit-knightcivicmediaconference/ * redundant, but good to have everything in a named folder, and also good to have a descriptive filename http://archive.publiclaboratory.org/cambridge/2011-6-22-massachusetts-cambridge-mit-knightcivicmediaconference/raw - raw images http://archive.publiclaboratory.org/cambridge/2011-6-22-massachusetts-cambridge-mit-knightcivicmediaconference/tms/openlayers.html - openlayers http://archive.publiclaboratory.org/cambridge/2011-6-22-massachusetts-cambridge-mit-knightcivicmediaconference/tms/2011-6-22-massachusetts-cambridge-mit-knightcivicmediaconference.html - google maps http://archive.publiclaboratory.org/cambridge/2011-6-22-massachusetts-cambridge-mit-knightcivicmediaconference/geotiff/2011-6-22-massachusetts-cambridge-mit-knightcivicmediaconference.tif - geotiff ...