During a trip back to Paris by train, I quickly coded for a project of mine a new brush for SyntaxHighlighter, a client-side syntax coloring library powered by Javascript, in order to highlight YAML code snippets.

YAML syntax highlighting brush

You can get the code here and provide feedback in a dedicated thread on the official forum.

Edit: Oops, didn’t find this already existing brush (I hadn’t wifi access in the train). I think my version support more specific aspects of the syntax, though.