CASA release Google Map creator
thanks Donna:
Google Map Creator is a freeware application designed to make thematic mapping using Google Maps simpler. The software is part of the GeoVUE Project at the Centre for Advanced Spatial Analysis [CASA].
If you have a shape file [and the associated bits], this free piece of software by Richard Milton of CASA will let you create a Google Map of the data and provide you with a web page which you can then publish.

December 7th, 2006 at 9:26 am
I have been using this for a while, works OK but a little clunky. You have to have numeric fields for it to work, and it doesn’t seem to deal well with ranges on it’s own. My work around is to create a new field in the shapefile which has an integer classifying the record into one of my desired ranges, then build the tile set. It also can’t translate many State Plane coordinate systems. My work around there is to reproject the shapefile to a World system.
Two maps I have quickly thrown up can be found at:
http://www.nonprofitcentermilwaukee.org/datacenter/mcmtenure.html
http://www.nonprofitcentermilwaukee.org/datacenter/mcmarea.html