A reader sends on this link to the briefs presented at the Maritime Liaison Office (MARLO) at NSA, Bahrain's Conference held in Dec 2006 at Dubai, UAE. All are in pdf format and are worth wandering through.
Much of the materialwill not be a surprise, some of it may seem obvious, but it is still worth taking a look at. The breif from the International Centre for Polical Violence and Terrorism Research (part of the IDSS, Nayang Technological Univeristy, Singapore) has some "lessons learned" from previous al Qaeda attacks on shipping, including successful and planned but unsuccessful attacks. The slide below captures some of that information:
You might note the attention paid to key chokepoints in the presentation. See also here.