This footage seems to have first appeared thanks to SF Truth activism, as blogged about @ http://www.911blogger.com/node/9497

The key (and apparently unknown heretofore to truthers, from what I can tell) footage occurs beginning at approximately 0:59, where we see the intact east penthouse collapsing from a new and closer angle than I've ever seen before. This footage will be VERY important to get in as high quality as possible in order to examine it for squibs, ascending wavefronts on the NW corner of the building prior to global collapse, etc.