Most folk convert from crab to wing down in the last 50 ft or so. Wing down is where you drop the into wind wing and keep the aircraft straight with rudder so the controls are crossed. This is better for gusty conditions if you are quick enough with aileron and rudder to keep to the centre line in the round out and flare.
Do it well and you land one wheel at a time!
I've seen this written in various ways, I think of it the other way round i.e. aligning the aircraft with the rudder then using aileron to keep from drifting with the cross-wind. I suppose aerodynamically it amounts to the same thing though i.e. a side-slip.