Actually bought the 11.6 inch 128 GB version this afternoon - have to say that it's an amazing little machine. They keyboard is nice, screen nice and bright, quick to transfer from my Time Machine from my old MBP. It's amazingly light too - remarkable in fact. Also watched the MacBook Air video on Apple's website and although it took 20 seconds to start once it got going there were no problems - I was surprised at how loud and clear the speakers are.
Overall, very impressed and happy. BUT, the lack of backlit keyboard is a majorly stupid thing to leave out with a notebook this expensive, and this good otherwise. That is very silly and takes away from what is a delicious user experience. Nine out of ten.