ArcGIS 2 GoogleEarth

Export to KML 2.3.5 is an extension developed for ArcGIS 9.x by the City of Portland, Bureau of Planning. The extension allows ArcGIS users to export GIS data in “keyhole markup language” (KML) format for viewing in the free Google Earth data viewer. Any point, polyline, or polygon dataset, in any defined projection, can be exported. The dataset's layer symbology (or a specified attribute) can be used to create categorical symbols in Google Earth. Features can be exported as either 2-dimensional features, or "extruded" upwards by an attribute (or, in the case of true 3D features, by z-value).

Some other features: ability to incorporate ArcMap layer symbology into the exported KML; labeling of point, line, and polygon features; "describe" individual features using attributes or other infomation.