This BBC story is a good one on the first French analysis of the crash of Air France 447. Most surprising is that the investigators believe the A330-200 was intact when it hit the water in what sounds like a more-or-less level position, on its belly. Earlier reports suggested the plane broke apart in the air.
This CNN story has additional detail. This Reuters story says there is no need to ground the airplanes; hysterical headlines yesterday suggested this might be the case, often failing to distinguish that the suggestion was from a lawyer representing victims and not from a government agency. This London Times report has additional detail.