Boeing FCTM's mention to respect the stick shaker at all times.
Good advice, they should also suggest that pilots respect the red bit at the bottom of the speed tape.
Generally, as previously posted, stick shaker onset is a factor of AoA, usually 1.1 Vs and does not reference the FMC weight inputs.
If the barber pole is closer than normal to your IAS or target speed something is not right, FMC or actual weight is not correct.
Obviously this will only be of use once airborne and won't protect you for take off calculation/loading errors.
Last edited by Hey Driver; 14th Feb 2012 at 07:13.