For Your Geographers: MapFrappe.COM: An Interactive Site For Cartographic “Mixtures.”
Link 1: MAPfrappe - Move Outlines
Link 2: MAPfrappe: Index of Outlines
MAPfrappe is a Google Maps mashup that lets anyone outline an area on one Google Map, and compare that area on another Google Map. Outlines can be saved.
United Kingdom and Ireland compared to South Africa:
Compare other features: Parks, Buildings etc:
Kensington Gardens, Hyde Park and St James Park vs central Park:
Or trace and save your own outlines.