GSHHG (formerly GSHHS) directories:

latest/             contains version 2.2.2 data and shapefiles
oldversions/   
oldversions/version1.10   contains version 1.10 data
oldversions/version1.2    contains version 1.2. data and shapefiles
oldversions/version1.5    contains version 1.3 data and shapefiles
                           and version 1.5 supplemental software files
oldversions/version2.0    contains version 2.0 data, shapefiles, etc.
oldversions/version2.1    contains version 2.1 data, shapefiles, etc.
oldversions/version2.1.1  contains version 2.1.1 data and shapefiles
oldversions/version2.2.0  contains version 2.2.0 data and shapefiles

see http://www.ngdc.noaa.gov/mgg/shorelines/ for more information
and links to the originator's web site.