I went to the MythBusters forums to submit a show idea related to steel-framed building collapses only to find the following information:

"Please, do not post show ideas that are 9/11 conjecture. They will be removed as they are reported.
-MythMod"
http://community.discovery.com/eve/forums/a/tpc/f/9551919888/m/6851957429

Curious, I emailed them about this: