May I just chip in to remind folks that early in all the various AF447 threads there was considerable discussion of the two previous Air Caraibes incidents of pitot icing and Unreliable Airspeed Indication issues. In those instances (both handled successfully) the flight crews reported that a major problem was contradictory advice in the checklists over Stall Warnings, and as to where to ignore them or follow them. Broadly speaking, the PF decided to ignore a - false, as it turned out - stall warning, using his airmanship experience to fly the plane by attitude and thrust until they sorted out what information the a/c was or was not giving them.
A reasonable English summary of the incident is at:
captainchas.com & airbusforums.net • View topic - Air Caraibes precursor to AF447...
and a scan of Air Caraibe's own internal incident report (in French, but with all the checklist stuff in English) is at:
Air Caraibes Airbus A330 memo