I'm sorry, but Apple's fixation on thin certainly should be a case study for sociologists. The new Air models are indeed physically attractive and prove my long held contention that Apple is really not a technology company at all, it is a design and marketing company.
I don't doubt the Air will sell and will be aggressively advertised. I am certain it is well made and- within the severe limitations of its hardware- will work fine. It is clearly a limited functionality notebook. It can't be a netbook because Steve Jobs hates netbooks.
What I hope we can avoid is anyone claiming it is somehow innovative. The first netbook I owned had a 128Gb SSD. And making something thinner isn't innovation unless you have made some breakthough that stands out. I have an HP notebook that is less than one inch thick and under 4 pounds. Getting one more pound and a few more millimeters off the device doesn't make it a better product. At some point, the reductions in weight and size become so small as to be meaningless. It becomes more of a "we're doing this because we can" thing that does not add an ounce of meaningful usefulness for a consumer.