It's easy to spend a lot of time on the site: if you want to see a good example of suburban Atlanta's development check out our ERDAS office location:
5050 Peachtree Corners Circle, Norcross GA. There's imagery from 1955, 1960, 1972, 1978, 1988, 1993, and 2007. When looking at the older images it becomes apparent that the entire area was developed over the past 20-30 years.
Make sure you check out the "Compare Two Years" option as well - it allows you to compare a second year to your currently loaded year and then adds a "swiping" capability to the viewer. Very cool!