Geocoding addresses for Google Maps and Google Earth
To geocode your adresses for google earth or google maps, the basic steps are:
1) find the coordinate points of your list of addresses
Batchgeo lets you download an Excel sheet which you can fill in and then paste into the system. It will create a map and it will send you the link. In the link, you can choose to 'edit the data'. This will open batchgeo with a data spreadsheet in the paste area. This data contains the latitude / longitude coordinates of all the adresses.
2) Google Earth Outreach Spreadsheet Mapper
This gives you another google documents spreadsheet which you fill in step by step. This will eventually generate a KML for you for Google Earth, but also for Google Maps.
There is also an excel sheet that should do it using the Yahoo geocoding system Media:MapExcelData.zip
The Google Maps Position Finder Applet shows you the GPS coordinates of the location you click on maps
There are a few more possibilities when trying to find the GPS coordinates.
If there are more than 400 data points, Google Funsion Tables allows you to import larger datasets into Maps / Earth.
KMLGeocoder and KMLReport are two programmes you can install. One will geocode for you, the other will report on successrate. Instructions here