http://www.davidrumsey.com/

Mostly historical stuff. But it's a fairly neat site to browse through. 
Note that if you don't have high speed internet it's going to be fairly 
slow; lots of high-res images and stuff. The old maps of Japan are 
pretty cool, and there's a GIS section that supposedly lets you take an 
old map and compare it with a current sat image. Unfortunately for some 
reason I can't view that particular page from work, and I don't have the 
patience to look at it over my slow dial up, so I'm not entirely sure if 
it's cool or not.

Enjoy!

John W.