The capture this month of one of Al Qaeda's top commanders has led to the arrests of at least 17 more suspects, including a trusted "courier" for the group's top leaders. The courier, terrorist hunters hope, may bring them one step closer to Osama Bin Laden. A notebook seized during the May 2 capture of Abu Faraj al-Libbi had coded entries, including names, and is being analyzed by a joint FBI and CIA exploitation unit in Virginia, sources said. Al-Libbi has clammed up since his arrest, but at least 17 people - including some named in the notebook - have...