Google Street View
Google added most of Bloomington to their Street View system on December 10th, 2007 as part of Indianapolis and surrounding cities. The images seem to be from summer of 2007, as people are wearing short sleeve shirts and IU is not as busy.
Estimation of dates taken
The picture of the old south-side Marsh shows that it is closed and may have been closed for a while since the signage is gone. So this would imply July 14th or later of 2007. Possibly August.