“Coda is awesome. Here’s a quick way to make it awesomer: invisible visible invisible characters!” – Justin via justinhileman.info

Coda lets you show all the newlines, tabs and spaces, which comes in handy. But the default settings are pretty distracting. If you change the invisible character display color to match the background, they only show up when you select text.

First do this:

Then change this:

And rock out like this: