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://drndl.grassrootsmapping.org/gulf-coast/2011-1-23-grand-isle-terre/geotiff/2011-1-23-grand-isle-terre.tif
* redundant, but good to have everything in a named folder, and also good to have a descriptive filename

http://drndl.grassrootsmapping.org/gulf-coast/2011-1-23-grand-isle-terre/raw/00124.jpg - raw images

http://drndl.grassrootsmapping.org/gulf-coast/2011-1-23-grand-isle-terre/tms/openlayers.html

http://drndl.grassrootsmapping.org/gulf-coast/2011-1-23-grand-isle-terre/tms/00124.kml
* i know this last one is weird but it may be local-path dependent -- maybe we can figure out a flag for gdal2tiles.py which will fix that

http://drndl.grassrootsmapping.org/gulf-coast/2011-1-23-grand-isle-terre/geotiff/2011-1-23-grand-isle-terre.tif

http://drndl.grassrootsmapping.org/gulf-coast/2011-1-23-grand-isle-terre/zip/2011-1-23-grand-isle-terre-raw.zip

http://drndl.grassrootsmapping.org/gulf-coast/2011-1-23-grand-isle-terre/zip/2011-1-23-grand-isle-terre-tms.zip