Interesting you have had so many changes with Delta
for this trip. (knock on wood). So far the only change we have had is a 5 minute change in departure time fro ATL to SLC on our return trip.
Did not effect our seat assignment either so no big deal. So far so good.

Wednesday 08/05/09
OH oh! I spoke to soon.
I noticed they have done some changing of seat assignments and of course when I go to the web site it won't let me make changes. @#*!