By the way, I'm using 11 inch mba as my main dev machine and here's how to take advantage of 16x9 displays if you're using emacs:

- you can split your emacs frame into multiple columns with C-x 3 (and balance them with C-x +), this way you can see two or even three files side by side.

- you can use emacs follow-mode which creates one virtual window split into multiple buffers, which is very useful for 768px high displays.