Census Shape files to KML (and more)
This from Bruce [corrected from Brian] Ralston, Professor and Associate Head of the Department of Geography at the University of Tennessee:
I have released a program called AFF Mapper. This is a Windows based package that was specifically designed for creating KML based mapping files from TIGER shapes and tables available from the Census Bureau’s American FactFinder web page. While it was designed for these files, it can be used to create KML files for other shapes (that are in decimal degrees with NAD83 or WGS 84) and external attribute files. The resulting KML files can be viewed in several free mapping packages such as Google Earth and ArcGIS Explorer.
To download a copy of the program and the user manual [visit this page].
This is freeware, copy till you drop.
Slashgeo reports source code will be available at a later date.
