I was perusing this site, and wondered if anyone has collected more granular 
timespan imagery?
<http://www.fas.org/irp/overhead/groom.htm>

They have satellite imagery from 1968, 1998 and 2000 showing advances in 
image quality improvements.

It would be really neat to see annual images in a slideshow fashion to 
denote construction and expansion progress over the years...
It would be like watching ants work I guess <g>