I love it when I find a new and exciting way to view my genealogy data, especially when it provides a unique perspective into the relationships between people and the places they lived. Splatter: The GEDCOM Population Distribution Heatmap is the latest in my suite of free online genealogy tools. It will Splatter all the locations in your database across the face of a fully featured Google Map.
In Splatter, location markers are grouped into clusters and the total number of persons found within that cluster displayed inside the cluster icon. These clusters are also represented on the surface of the world as a heat map. This initial view gives a great overview of the world wide distribution of the people in your database. Zooming in exposes location markers. Hovering over these displays a conversation bubble with the list of persons found there.
Click the link above for more details on how the map is built and functions.