Besides, Yousef: in prison for life. Murad: in prison for life. Blind Sheikh: in prison for life. Many other member of Yousef's "cell" in America: in "cells" for life. So the fact that he may have once said he wanted to ram planes into buildings--well, at least from a pre 9/11 POV, that threat was tempered by the fact that he was captured and put in jail.
Same with Moussaoui. People are screaming now because some analyst merely said Moussaoui was the TYPE who might "fly a plane into the World Trade Center" but, gee, he was arrested a month before the attacks as well. I still don't see anything to indicate that a solid when-where-&-how that would have prevented 9/11 was overlooked.
I did several searches over the weekend to determine whether the plan to ram planes into buildings in the U-S was made publicly available prior to 9/11. The only place this came up was in the reports of various terrorism experts, like Laurie Mylroie, and in the 1998 briefing that Horowitz describes, in which the specific plan to do that was not mentioned. The news release instead includes references to blowing up U-S airliners, as Horowitz notes.
This report may have been mentioned in some New York newspapers on or TV, but it was not widely disseminated at the time of the trial, and the content is no longer available on the web (at least in a generic search.)
It is not the responsibility of federal prosecutors to transmit this information to the White House. Neither is it the responsibility of people like Condi Rice to review transcripts of federal trials that occurred under a different administration to determine whether there is a terrorism threat.
This report was NOT widely available prior to 911, although it might seem that way. There was nothing on Free Republic, either. Try it, and you'll see. Every which way.
As Horowitz says, there's no proof Clinton knew about it, and no proof he did NOT know either. All we do know is that the FBI did not include the details in the report to Congress. So I don't think that is the fault of Condi Rice.