I was initially torn between getting a MacBook Pro and a 128 gig Air (they're priced about the same), but after watching great reviews online and seeing Marco loving his 13" Air, I decided that the Air is a better match for me. My work doesn't really require me to use heavy software so I don't need something as powerful as an MBP. I do need something portable and super fast, which is where the MacBook Air comes in.
As expected, I was wowed by the performance of this slim (to the point of skinny) and lightweight laptop. Heavy apps like iPhoto and Garageband open in three seconds with no fuss. Basically, doing ANYTHING is a breeze in this machine. It's now my work computer! It's a bit smaller than I'm used to, at 11 inches, but the high screen resolution more than makes up for it.