So I've gone through most of this thread and I still can't decide.
Basically, what I'm looking for is a protective SLEEVE.
Something that I don't need to take out of my bag, just unzip and pull out the MBA, but has good protection, and some water resistance, so not wool, felt or neoprene.
This is Exactly what I am looking for! Something I can keep in my bag for protection or can carry sans my bag when just needing my computer. I'm sort of leaning towards the booq viper case deal for the MBA. Still not totally sold though.