The Chicago Tribune has a five-part series on making maps using PostGIS, TileMill, Mapnik and Google Maps. Each part reviews one aspect of pulling together a complete online map with Google Maps as the base.
The series covers:
- Less Interactivity
- Prepare your data with ogr2ogr and PostGIS
- Make it pretty with TileMill
- Render with Mapnik
- Overlay on a Google Map and deploy