There are NUMEROUS posts about wind noise on the driver side (along with cold air infiltration during winter months) since the beginning of Air's launch. Several solutions have been suggested and tried (by owners and service centers) with varying degrees of success (sustained and unsustained). There do appear to be different sources/reasons to the sound, thus the different approaches to resolving it.
I, for one, have accepted this phenomenon as a design/material consequence of the Air and simply live with it. Prefer to reserve my energies for more significant considerations. It is a nuisance for me, but not a deal breaker. I just love driving it!