As per the instructions on the Jekyll install page,

gem install jekyll

then (since I didn’t have this set already):

export PATH=${PATH}:/Users/maier/.gem/ruby/1.8/bin

added to my Bash ~/.profile file.

Pygments is cool for syntax highlighting. On a Mac with MacPorts, it’s as easy as this:

sudo port install python25 py25-pygments

Running Jekyll with its standalone server is great for testing your site locally:

jekyll --auto --server

That’ll run an embedded web server at http://localhost:4000 (by default); anytime you change any of your site files, Jekyll will reprocess them and make them available immediately. All you have to do is refresh your browser.