11:59 AM

jwz - historical maps:

Rumsey has a collection of 10,000 historical maps scanned in at extremely high resolution, and has been doing a lot of really cool stuff with them, like taking old maps, correcting their scale to match up with reality, and letting you crossfade between old and modern maps of the same area; placing the maps on a globe and letting you zoom in from space; combining the maps with topographical data and letting you fly through 3D scenes; and all kinds of stuff. Not only is there a vast amount of data on his site, there are also really cool visualization tools.