If you’re using emacs to write your jekyll blog posts, there is a mode to help you with some common tasks. It is originally from metajack. Recently I thought it could be a nice addition to have syntax highlight support for jekyll posts, so I got my hands dirty and after some hours of lisp hacking (this was my first attempt at lisp programming) it was a reallity. It is based on nxhtml so you need it to work.
Here is an screenshot of it at work:
You can get it here.