Bwild:   One has to go very deep into any conspiracy theory regarding 911.  It would be one thing if only one plane were involved, but 4?  And there are clear images that prove that flight 77 did in fact hit the Pentagon.  But conspiracy theorists want to keep the conspiracy alive so they discount the evidence.  Here's a good example:  http://www.youtube.com/watch?v=YTNRkb7AaQk&feature=related

For an opposing view this may be helpful:  http://911research.com/

I remain skeptable.  I agree it's fair to ask questions but if one poses those questions as conclusions, that's where I leave.  Asking me is one thing, telling me is another.  There are two sides to the story and I find the non-conspiracy explaination more credible.