This is a little out there but I was watching the CNN feed of the
second tower collapsing and couldn't help but notice the timing
of the long "zoom in" shot, was just too perfect to catch the collapse.

http://911research.wtc7.net/talks/wtc/dustvolume.html

scroll down and click: CNN video of North Tower collapse

It is the 2nd shot, try watching with the sound down and tell me what you think?

cheers

Jimmy

PS. I also posted this observation at 911 Blogger but I think it is burried
too far down the postings.