A great collection of photos of the WTC Towers debris fields. They were originally made public by someone through 9-11 Blogger who "wasn't sure if they would be of any use". They remain some of the best close-up debris photos available. Thanks to this person.
Photo compilation and analysis of the moments of "collapse" initiation. This analysis shows that the first most powerful ejections witnessed in the North Tower happened in 2 distinct clear horizontal rows and were separated by 3 floors.
Aman Zafar photos from his apartment. An excellent collection.
He took high resolution photos capturing the "spires", which were interconnected portions of the core columns seen clearly standing intact after the rest of the towers "collapsed".
Spires were witnessed in the "collapses" of both towers.
(Takes a few moments to download)