I would imagine that underslung engines would cause horrendous problems in all cases, such as the Ethiopian 767 that you mentioned. Personally, the only succesful ditching I have come across was a Nimrod somewhere near Kinloss a year or two ago. Apparently a textbook ditching, which shows how good the guys are, however the tail still broke off! I have always thought that the safety cards showing Boeings, Airbus et al bobbing merrily in the sea with smiling passengers on the wings were a bit optimistic. Anyone know anything else ....?