mapz: a gis librarian has updated his ArcMap2GMap script for exporting ArcMap layers to a standalone Google Map page; in addition to points and lines, it now includes support for choropleth polygon layers:

Runs on ArcGIS 9.1 and 9.2, not yet tested on 9.3.
Related posts:
- A Few More Free Toolsets For ArcGIS
- Free ArcGIS Extensions For Municipal GIS Applications
- Free Toolsets for ArcGIS
- Free Resources For ArcGIS 9.3
- Intro To MapWindow IV – Advanced Vector Tools
- Simplifying Line And Polygon Shapefiles
- Free Sampling Design Tool Extension For ArcGIS
- Online Google Earth Utilities For Buffering And Area Calculations
- Map-Related Google Gadgets For Your Webpage

I find this modules interesting