I’ve taken to using my external monitor and flipping it up on it’s side so that it is vertical. It’s really cool, actually! I use my main Retina Macbook here to do my editing, but the big one on my right is used for surfing the web or doing other things. It’s handy to stack things up so high, and certain websites look really incredible in that format. It’s kind of the dimensions of a mobile phone, I guess… just a huge one!
I use a cool program for the Mac called SwitchResX to help make this possible, which I highly recommend! It’s also a cool program for doing other unique resolution-things… very handy!