No, I haven't read Without Precedent. I consider your recommendation to read it to be a pretty fair one.
Then read it.
With all of that out of the way:
What government officials and employees to you believe should be held accountable?
see below
What evidence of their wrongdoings do you have to offer?
Are you serious? Even if you work with the official story, the President of the United States and his cabinet are charged with protecting the population of this country. (Please, again, remember that I am working off the idea that the 9/11 Commission report is accurate which I do not feel that it is), some evidence would be those holes in the ground where buildings and people once stood. Or that chunk that came out of the pentagon. Or that plane that crashed in PA, regardless of how we think it crashed.
Our leaders should not be excused from being reprimanded for their incompletence, that's not how a democracy works. The 9/11 Commission report basically says, "someone dropped the ball. but we don't want to look at who dropped it. we want to look at how it looked when it dropped and what kind of sound it made when it bounced off the ground."
What do you propose be the punishment of those that failed us in your eyes?
I dunno, impeachment perhaps. Some jailtime and the American people's ability to select new leaders who we feel are more compentent. Unless you feel comfortable under the Bush administration that is.
If you can't provide a meaningful answer to all three of the above questions, please don't waste my time answering any of them.
I think my reply was frankly more than you could have hoped for. So I'm pretty ok with it.