Abdussattar Shaikh:

http://www.msnbc.com/news/805186.asp?cp1=1

"THE CONNECTION, JUST discovered by congressional investigators, has stunned some top counterterrorism officials and raised new concerns about the information-sharing among U.S. law-enforcement and intelligence agencies. The two hijackers, Khalid Almihdhar and Nawaf Alhazmi, were hardly unknown to the intelligence community. The CIA was first alerted to them in January 2000, when the two Saudi nationals showed up at a Qaeda “summit” in Kuala Lumpur, Malaysia. FBI officials have argued internally for months that if the CIA had more quickly passed along everything it knew about the two men, the bureau could have hunted them down more aggressively."
<snip>

"In September 2000, the two moved into the home of a Muslim man who had befriended them at the local Islamic Center. The landlord regularly prayed with them and even helped one open a bank account. He was also, sources tell NEWSWEEK, a “tested” undercover “asset” who had been working closely with the FBI office in San Diego on terrorism cases related to Hamas. A senior law-enforcement official told NEWSWEEK the informant never provided the bureau with the names of his two houseguests from Saudi Arabia.

Nor does the FBI have any reason to believe the informant was concealing their identities. (He could not be reached for comment.) But the FBI concedes that a San Diego case agent appears to have been at least aware that Saudi visitors were renting rooms in the informant’s house. (On one occasion, a source says, the case agent called up the informant and was told he couldn’t talk because “Khalid”—a reference to Almihdhar—was in the room.)"

from his book "My Jihad":

(*Thx to Johnhorne, UK):

"While in Pheonix we would spend time playing with Ghareed's Arab buddies. <...>

<**Ghareed is a Saudi - no fuller name is ever given. At one point he lived in Sierra Vista, Arizona, on the doorstep of Fort Huachuca - vase for army & FBI military intelligence training (http://huachuca-www.army.mil/)**>

"I didn't have anything against him; I just didn't like him all that much. He was a little scrawny guy, short and maybe 150 pounds with his clothes on. He seemed like more of a follower than anything, the kind who would get caught up in something just because other people were doing it. He was one of the many Arabs whom Ghareeb would visit to talk about Jihad.

I didn't like how these guys acted. They were what I call "Hanky-panky Arabs"; they participated in forbidden activities like drinking alcohol or perhaps eating hotdogs and screwing around. They lived in America as any other person might, but got all excited about jihad stuff when Ghareeb told them stories or brought them videos."

<...>

The little scrawny guy was taking flight lessons in Scottsdale, right up the road from my house. I'd known some of his roommates before Ghareeb had starting talking to him and was good friends with one of them. They were all taking flying lessons, and my friend was already rated for twin-engine aircraft. <...> I was still working for the Bureau at this time and reporting to Andy <*his FBI contact - Andres Sanchez*> regularly. Both the FBI and Andy were fully aware of all the Arabs whom Ghareeb and I had contact with, including the scrawny little guy whose name is widely now known: Hani Hanjoor. Hani Hanjoor would get his pilots license in 1999 and would fly an American Airlines plane into the Pentagon. They were hardly "deep cover sleepers" as the FBI is calling them now. They lived very openly, and although I had no idea what some of them would eventually do, they made no secrets about what they thought or believed."

("My Jihad, p213-4)

Introduction to the book:
http://rp.publicationsunbound.com/samples/sample1585745650.pdf

Amazon:

US: http://www.amazon.com/exec/obidos/tg/detail/-/1585745650/qid=1032804613/sr=1-1/####/002-7264282-7696863?v=glance&s=books

UK: http://www.amazon.co.uk/exec/obidos/ASIN/1585745650/####/202-6728658-5131868

He says he used to 'hang out' at Robert Young Pelton's "Black Flag Cafe" but that forum seems to have degenerated in the last 12 months.
http://comebackalive.community.everyone.net/community/scripts/directory.pl

Aukai Collins claimed, he observed Hani Hanjour, which was denied by the FBI some months ago:

http://abcnews.go.com/sections/wnt/DailyNews/FBI_informant020523.html
FBI Was Warned of Sep 11 Hijacker
May 23

"...A paid FBI informant told ABCNEWS that three years before Sept. 11, he began providing the FBI with information about a young Saudi who later flew a hijacked passenger plane into the Pentagon..."

Aukai Collins, the informant, said he worked for the FBI for four years in Phoenix, monitoring the Arab and Islamic communities there. Hani Hanjour was the hijacker Collins claimed to have told the FBI about while Hanjour was in flight training in Phoenix.
Twenty hours after ABCNEWS first requested a response, the FBI issued an "emphatic denial" that Collins had told the agency anything about Hanjour, though FBI sources acknowledged that Collins had worked for them..."

http://www.signonsandiego.com/sept_11/terror_home/images/disbelief.jpg

Abdussattar Shaikh was the so called "informant" (Khalid Almihdhar and Nawaf Alhazmi) for the FBI (Due to Newsweek).

However he said, he was "unaware that boarders Alhazmi and al-Midhar were plotting to fly a jet into the Pentagon"
http://www.signonsandiego.com/news/nation/terror/20020910-9999_1n10muslims.html

From the same article:
September 10, 2002

"It's very disturbing," a Muslim leader said. "It hurts. This creates a lot of disharmony. A lot of people are really angry and feel betrayed by both Shaikh and the FBI. If he was an FBI informant and these people lived in his house, how come the government did not detect them, and how would he not figure out these were bad guys?"

San Diego FBI chief Bill Gore could not be reached yesterday, but in previous interviews he has taken unusual steps to assure reporters that Shaikh was not suspected of collaborating with the hijackers. The FBI does not believe Shaikh deceived agents, sources said..."

Other reports about Abdussattar Shaikh:

http://www.signonsandiego.com/sept_11/terror_home/disbelief.html

"..“They kept me in their arms a long time,” Shaikh said. “They made me feel like I was wanted.”

He also remembers how FBI agents went door-to-door to assure his neighbors that Shaikh was not a suspect in the terrorism against his adopted country...

...Al-Midhar stayed about six weeks, telling Shaikh he was going home to see his baby daughter. Alhazmi left in December 2000, saying he was moving to San Jose. He later called Shaikh and told him he was in Arizona taking lessons to be a pilot.

He remembers them as polite, compassionate and devout. He had absolutely no inkling, he said, that they would commit mass murder.

But three days after the attacks, a radio news report identified them as two of the hijackers who had crashed an American Airlines jet into the Pentagon. Shaikh pulled his car over and called the FBI from a pay phone...."

http://www.signonsandiego.com/news/op-ed/lubrano/20020107-648-amusliml.html
January 2002

"..."I wasn't hiding from the police; I wasn't hiding from the FBI," Shaikh said, "but I was hiding from the media." At times, Shaikh felt he was being stalked...."

Interestingly an Dr. Abdussattar Shaikh is mentioned at the board of the San Diego Police Department:

http://www.sandiego.gov/police/help/review.shtml

I remember, after his first "arrestment", that Shaikhs computer was confiscated, which the FBI believe, was used by Nawaq Alhamzi.
http://www.cbsnews.com/stories/2001/09/14/archive/main311329.shtml

Why the FBI never told us, what was on the harddrive?

http://www.nctimes.com/news/2001/20010921/70203.html

"...Shaikh helped Alhamzi open an account at a Bank of America branch, and also helped him post a personal ad on the Internet after Alhamzi expressed a wish to marry. The ad drew no responses.

Like Alhamzi, a suspected hijacker called Ziad Jarrahi seemed congenial.

"The nicest guy in the world. Very humble, very soft-spoken," said Bert Rodriguez, who owns the U.S. 1 Fitness Centers in Dania, Fla., and was Jarrahi's personal trainer..."

Abdussattar Shaikh still denied, that he was a FBI informant.

NOTE:
I think if Abdussattar Shaikh was
really a kind of informant, they later used him as a
scapegoat as well and made some stories up.
Maybe they sniffed some infos about these 2 suspects to use them later for the FBI-profiles.

"...He converts to Islam, goes overseas to fight for the fundamentalists, returns to the USA, becomes an FBI informant, and coincidentily, has two of the hijackers involved in 9/11 room with him in his building. . ."