Mapalist is a wizard for creating and managing customized Google maps of address lists
KMLCSV Converter is a free open source software that enables you to convert Google Earth KML file to a formatted CSV file (and vice versa). This CSV file can then be uploaded into your Garmin GPS by using Garmin POI Loader, which can be downloaded for free. This allows you to easily plot all custom point of interests (POI) through Google Earth first before transfering them into your Garmin GPS. For further instruction in how to use to do so, please refer to the Tutorial.
Use Yahoo pipes to display a Google calendar in Google Maps. Praise for Tony Hirst
XML to XLS conversion is easiest with Excel
New York citywide hospitals: here
Belgian carehomes (dutch): here
Google maps H1N1 Swine Flu tracker: here
Health Informatics Events calendar KML file (copy link and paste it in the Google Maps search window): http://is.gd/1kSGj
If you know more examples, please add.