I have a hard time working on my 13" Air's screen. I'm only really productive with it when I'm doing a very particular kind of implementation task. That is, one

I have a hard time working on my 13" Air's screen. I'm only really productive with it when I'm doing a very particular kind of implementation task. That is, one where I can have code in one column and a terminal in the other. It's difficult to do tasks that involve many varied reference materials (code, web pages, documents), switching back and forth between my terminal, editor, AND browser. Or lots of small code files with lots of navigation and window re-arranging. That said, reading & emailing is pretty easy. Until I need to cross reference an article with two emails and then copy paste between them. Blargh. Anyway. Why not a Pro? Why would I want a heavier machine? I can easily SSH into a beefy dev box. And most of the code us startup types write for the web or mobile devices don't demand beefy CPUs. The trade off between performance and form factor only makes sense if I'm going to use my laptop for anything other than a dumb terminal. And I do put that 13" air in a backpack.