Oh dear, another paranoid conspiracy theory based on, well, nothing, really.
Starting with a recording of Hitler isn't the greatest beginning, then going into a bunch of quotes from "eyewitnesses" who reportedly saw "a small aircraft" or a "missile" (like they're not distinguishable!) and then claiming that their "it wasn't Flight 77" theory is backed up because a bunch of security camera videos *haven't* been realeased hardly offers any credible proof.
For a slightly less hysterical (and somewhat more believable) opinion see:
http://www.snopes.com/rumors/pentagon.htm