Along with the recently released Flight 77 video, there were some documents released by the NTSB that I haven't seen before. Perhaps there are some researchers out there who haven't seen the attachments below either;

(Note: The following documents are in PDF format. You will need to download and install the free Adobe Acrobat Reader to view.)

Debris Trajectory Study--UA175 - 5.12 MB

Radar Data Impact Speed Study--AA11, UA175 - 9.14 MB

Recorded Radar Data Study--all four aircraft - 8.17 MB

Video Data Impact Speed Study--UA175 - 7.99 MB