Shapefiles for coastlines produced by the coastline error checker. There are a number of files:

Files sizes accurate for 26 October 2009.

To see how they are used, see the Mapnik coastline-error layer configuration.

Proj4 projection string (Spherical Mercator): +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over