Having decided to skip the Sandy Bridge Air, and with the next gen Ivy Bridge Air just a few months out, I'm now wondering whether it's worth holding out for the Haswell Air?
https://www.macrumors.com/2011/09/13/intel-previews-low-power-haswell-processors-for-2013/
https://www.macrumors.com/2011/09/13/intel-previews-low-power-haswell-processors-for-2013/