The BBC has reported the incident analysis of the Air France crash that killed 228 people was due to lack of pilot skill in dealing with a high altitude stall.
Here is a link to the BEA Report from the Bureau d’Enquetes et d’Analyses. It’s a frightening read, as they give a moment by moment analysis of the last minutes in the cockpit. No emergency was ever noted and there did not appear to be any mechanical failures. It appeared that the flight crew thought events were under control the entire time (despite the alarms.)
Photo credit Vin Crosbie at Flickr.