There are many ways to get information into Google Earth. The easiest is to simply add your own "placemark" manually with Google Earth software. You can also upload static images and manually reference them.
Similarly you can export data from a GIS into KML format. If you search www.esri.com/Arcscipts for "KML" you can find some free conversion scripts that work in Arcview/ArcGIS.
There are many different ways to generate KML files. It's a relative to XML and the documentation can be found here.
http://www.keyhole.c...ml/kml_tut.htmlhttp://kml.tjworld.net/#reference__
Matthew