One thing that fascinates me about the MacBook Air is how perfectly it is weighted: Its center of gravity is right in the middle, as shown by this picture of my MBA standing on a guitar slide (it's just slightly off-center in the picture because that's an SSD MBA, and the SSD is a bit lighter than the hard disk. A hard disk MBA has the center of gravity perfectly in the middle. However, such a slight deviation cannot really be felt when you hold it in your hands).

I've seen quite a lot of "super-portables" from other manufacturers that are a bit heavy on the side where the battery is attached, making it feel pretty awkward when you pick them up in one hand. Not so with the MacBook Air! It's just this type of details that I love Apple for.