www.clustrmaps.com – This service provides (free) the
HTML that gives you a tiny map. When it loads, it increments a counter and shows the locations of all visitors to your page, cumulatively (even for huge numbers). Clicking on it zooms in to a big world map, and (optionally) lets you zoom in to the continents, as in the example above. For light users (under 2500 visitors daily) the service is free, forever, and stores cumulative totals up to millions of visitors. Paying users get extra features.