I created a tutorial that will step one through how to create a density map with Prototype, the Google Maps API and the HeatMapAPI. The final product: a density map of liquor licenses in Milwaukee, WI. <http://jeffreybarke.net/2008/07/density-map-tutorial/> Jeffrey — Jeffrey Barke Senior developer / information architect theMechanism New York 440 9th Avenue 8th Floor New York, NY 10001-1631 e: jeffrey.barke at theMechanism.com w: http://theMechanism.com t: +1 212 404 3150 f: +1 212 404 3228 — theMechanism is a multi-disciplinary design agency with offices in New York, London and Durban, South Africa.