Hints, warnings and information boxes

Over the past few years I've been writing a lot of documentation and user guides for various projects - experimental equipment, grid software, etc. - and one technique I've often borrowed from great guide writers like Hartl is the use of little pop-out boxes to make certain points stand out. Specifically, I like to add Hints, Warnings, and Points of Information, as shown in the image below.

Fortunately these are pretty trivial to add in LaTeX thanks to the tcolorbox package and a macro or three inspired by this TeX StackExchange post. I've embedded a Minimal Working Example in the Gist below to give you an idea of how it works (which also generated the above image). Pretty handy, eh?