One of the huge draws of the 12" Powerbook (and actually, the iBook, the current Macbook, and the Macbook Pro) was its ability to be used as a single computer--as an all-in-one package. No desktop, no second laptop, nothing but the one. So, would you use the Macbook Air as your only, solo, 24/7 computer if you had the chance? I ask because I've seen a lot of posts by people heralding the Macbook Air as a worthy heir to the 12" Powerbook of yore. I'd like to see how the prospect of using it as a solitary machine would change opinions, if at all.