http://www.spatialdatalogic.com/cs/blogs/brian_flood/archive/2005/09/12/98.aspx
KML Home Companion 3.0.4 11/23/05 Converts ArcMap layers into Google Earth KML files Jim Cser, cser@metro.dst.or.us Offered freely to the community, but use at your own risk
This is an ArcMap extension designed to create KML format text files for use in Google Earth. I tried to create the simplest program that would do the job, so there is only a minimum of error checking or fancy features. Please feel free to modify the code, report bugs, or to make suggestions for future releases.
KMLer is the ArcGIS 9 extension for professional work with Google Earth.
Functionality.
Samples http://www.mi-perm.ru/gis/earth
Home page http://www.mi-perm.ru/gis/programs/kmler
Deployment & Requirements http://mi-perm.ru/gis/programs/common/faq.html
Read more about all programs on support page at: http://mi-perm.ru/gis/programs/programs.html
Free 7 day trial. Registration is $20us.