There seemed to be quite a bit of interest in this topic at LBN.
http://www.haaretzdaily.com/hasen/pages/ShArt.jhtml?itemNo=77744 Odigo says workers were warned of attack
By Yuval Dror <mailto:yuvaldr@haaretz.co.il >
Odigo, the instant messaging service, says that two of its workers received messages two hours before the Twin Towers attack on September 11 predicting the attack would happen, and the company has been cooperating with Israeli and American law enforcement, including the FBI, in trying to find the original sender of the message predicting the attack.
Micha Macover, CEO of the company, said the two workers received the messages and immediately after the terror attack informed the company's management, which immediately contacted the Israeli security services, which brought in the FBI.
.........Odigo usually zealously protects the privacy of its registered users, said Macover, but in this case the company took the initiative to provide the law enforcement services with the originating Internet Presence address of the message, so the FBI could track down the Internet Service Provider, and the actual sender of the original message. ......more