Apparently* An anonymous source has allowed the release of high quality DVD footage of all 3 WTC collapses. The North and South Tower & building 7. The source wishes to remain anonymous at this point, but you can download the files in high quality DVD format cut from the source video at the following links.
Please watch in HQ
Alternately, I've made a high quality DivX compilation of all 3 clips, you can download that here if you wish
*Not sure if this footage is a re-release of old footage,I will let the viewer hunt around for that answer themselves.
Credit goes to this YouTube User