This interactive map of Norwegian munici-palities is an example of the principle in Google Fusion Tables, where it is possible to use each others' uploaded data in third-party maps.
If the uploading person sets the map as being open, then other users may utilise the map for own use.
This actual map was generated in the Fusion Tables Layer Wizard, and all tabular data of the dataset is shown unmodified. It is also possible to combine two datasets to a new unique table.