One of the more interesting things I have found going through the 9/11 Commission files is this extract, taken from an FBI summary of its investigation into the 9/11 attacks:
UBL can be directly connected to the attack on the USS Cole in October 12, 2000 (ADENBOM 265A-NY-277013). The 200578 telephone number which was originally identified as significant through the KENBOM/TANBOM investigation was also used during the planning of the attack on USS Cole. FBI investigators have learned the 200578 telephone number is subscribed to by AHMED AL-HADDA, whose daughter is married to KHALID AL-MIHDHAR (Flight 77). The ADENBOM investigation has also linked ALMIHDHAR to both NAWAF AL-HAZMI (Flight 77) and KHALLAD, now identified as TAWFIQ MOHAMED BIN SALEH BIN ROSHAYED BIN ATTASH.

