Here is a rather huge collection of ’collapses’
Each clip contains titel, comment and source:

North Tower

http://investigate911.se/northtower.html
http://investigate911.se/northtower2.html
http://investigate911.se/north_hoboken.html
http://investigate911.se/north_new2.html
http://investigate911.se/north_new3.html
http://investigate911.se/north_new.html
http://investigate911.se/north_tower_demolition_analysis.html
http://investigate911.se/north_wtc.html
http://investigate911.se/wtc_collapse_abc.html
http://investigate911.se/wtc_collapse_nbc.html

South Tower

http://investigate911.se/southtower.html
http://investigate911.se/southtower2.html
http://investigate911.se/raresouth.html
http://investigate911.se/south_new.html
http://investigate911.se/squibbs.html
http://investigate911.se/squibbs2.html
http://investigate911.se/rare.html
http://investigate911.se/secondary_explosion.html
http://investigate911.se/south_wtc.html
http://investigate911.se/south_wtc_2.html

WTC 7

http://investigate911.se/world_trade_center_7.html
http://investigate911.se/world_trade_center_7_2.html
http://investigate911.se/world_trade_center_7_3.html
http://investigate911.se/building7.html
http://investigate911.se/wtc7.html

Best,
M