The entire report is available for free online.  I have read through a few chapters, and I must say it is sad, compelling reading.  The document is extremely well-written, and from what I've seen, strikes a very impartial, factual tone.

Chapter 1, "We Have Some Planes," brings all the emotion of that day back.  Each flight is detailed with exactly who was on board, the situation, and what transpired.  I was glad to finally read in detail about the heroism aboard the flight that crashed in Pennsylvania.  True American heros.

Here's a link to the complete report:

http://www.9-11commission.gov/