Interesting thread. I have had no wind noise issues but have noticed that, since the Air's cabin is so naturally quiet, any sound that does get in seems loud. I would like to try a dB meter in the car (or just wait for Bjorn Nyland's upcoming reviews). I know my 21" wheels make more noise than the 19s, but not enough to bother me.
A slightly open window will create quite a bit of noise. It's great that in a software controlled car adjustments can be made without tools and taking things apart. Great tip.