Does anybody know a web application (like a Google Maps Mashup) that allows putting maps or city/area outlines on top of each other to get a feeling for the area's dimensions?
Say, you want to know how New York is. You drag & drop an outline of your home city on top of a NY map, which can help get a feeling for the city's dimensions much better than numbers.
I found a web log entry that illustrates what I would like to see as an application of some sort. The true size of Africa