Google Earth Enterprise allows you to combine your own data with Google Earth data to provide a robust GIS solution to your organization. However this service isn't free but worth taking a look at. If you are using either of these products in your organization, stop by and post a comment on what you are doing with them and how it is going.
Online Mapping White Papers
- Internet-Based GIS for Local Government - Cayuga County New York
- Understanding MapShop for Media - Environmental Systems Research Institute