http://data.sa.gov.au/dataset/suburb-boundaries converted to geojson in a wsg84 projection
Licenced under a CC-BY-A (http://creativecommons.org/licenses/by/3.0/au/) licence, and with explicit permission for use in OSM (http://wiki.openstreetmap.org/wiki/Attribution/sa.data.gov.au_explicit_permission)
bundle
bundle exec ruby split.rb suburbs.geojson
produces geojson and .osm files