Google now offers geocoding services. Up to 50,000 addresses a day. I built a geocoding service from the Tiger/Line database in the past. Comparing its results with the Google geocoding results, and Google appears to be a bit better. I've been looking around the Google Maps API discussion group and the Google Maps API Blog and haven't found any information on the data sources that the geocoding service uses or the various levels of precision available.
Posted by moore at June 20, 2006 10:53 AM