I came across an old blog post by Brian Carper mentioning that he used Rhino to run JavaScript in Clojure, allowing him to have access to a good implementation of Markdown. "Clojure and Markdown (and Javascript and Java and...)" http://briancarper.net/blog/415/clojure-and-markdown-and-javascript-and-java-and http://www.mozilla.org/rhino/