Use google charts - Dynamic world map

Google charts can dynamically generate charts based on data. Using it you can create a front end, pass the data as parameters to a google url to generate your charts.

One example is world maps. An example of implementing this can be found on this site.

I used it to generate an image of all the countries I have worked and lived in.

Google uses their own dynamic charts (Pie charts, world map) in the google blogger stats section. Colours on the map to indicate weight.