Import your data from spreadsheets, maintain it with fun tools, share with coworkers and friends, publish to the world.
* Create a rich locator application
* Create and view sales territories, analyze trends, and evaluate performance by geography with your own data.
* Quickly visualize GIS datasets from Shapefiles, MapInfo files
* Share geo-data among members of your organization
* Geocode lists of addresses
via http://googlemapsmania.blogspot.com/2009/09/google-maps-creation-tool.html