Good idea on paper, but not quite. You need a lot of space on file server for all your files, I have at least 2tb, the air can't do that. We are not there yet, the cloud is the final unifying equation, but for the time being a nas and chronosync or idisk is what we have to make do with.
No, I don’t
The cloud is interesting, but it’s slow... and it’s no solution when you don’t have Internet access.
With my files on my Air, I can work anywhere: at the park, at a restaurant with no WiFi, at a client’s office where the network is locked, etc.