This is to microscopy what Google Maps is to cartography. Or what Microsoft's original satellite photo server seemed like in 1998 (say, whatever happened to that anyway?)

These microscope images are in the size range of like 50000 x 50000 pixels, many gigabytes in size, but here you can zoom in on them just like Google maps zooming in on the city of Atlanta. Or Fractint zooming in on the Mandelbrot set.

You can actually subscribe to a freakin' RSS feed of their latest images, too.

still there http://terraserver.microsoft.com , and seems a little easier to use than i remember from back then (scott)