MacWorld has posted a review of the MBA. It is an interesting read.
Is losing several hundred megahertz, dozens of gigabytes of hard-drive space, an internal optical drive, and FireWire connectivity worth losing two pounds? (Those are the differences between the MacBook Air and the MacBookif youre considering a switch from the MacBook Pro, the differences are even starker in both directions.) Each laptop user will have to answer that question for themselves.
As a longtime fan of small laptops, I embraced the MacBook Air with some trepidation. But once I slipped that three-pound laptop into my backpack and threw the bag over my shoulders, I realized that sacrificing some storage space and some processor power was ultimately worth it for me.