I've seen many angles of the WTC collapses, but for some reason this angle feels new, and it's remarkable:

http://911blogger.com/node/11066

Here are the YouTube addresses. You can download high-res video from this user as well:

http://www.youtube.com/watch?v=EZeaW4ybejs

http://www.youtube.com/watch?v=Xo7t3XQ2PbM