I have been involved with notebook computers since the beginning. I remember thinking is was really cool when Toshiba announced their Satellite series because there was no reason for all the extra junk that the larger notebooks had in them.
Now, with the Air, we have the best of all worlds.
As a developer, I can go anywhere in the world and develop any application for Web, Mac or PC and have a complete development environment at my fingertips.
We have had this capability since the announcement of Intel Macs, but this ultra-lightweight member of the family makes porting it around just all that much easier.
Bravo Apple!