Live NBC report from Gulfport:
Multistory structures down in a wide swath from the beachfront to in some cases, as much as 1 mile inland.
The video did show, however, that many similar structures are still standing, and in apparantly good shape except for broken windows. I think it will come down to a matter of construction practices and luck as to what buildings took what Katrina dealt out and remain standing, and which structures failed.