Lea Verou has released her syntax highlighters prism.js and prism.css as a free download.
A side note about Lea, she has just joined the W3C as a member of the the W3C developer relations and web education teams. If you are working in web education, perhaps you should find out a little about her if you don’t already know who she is.
HTML5 Doctor has an article to help you with Multimedia Troubleshooting.
An expose from .eduGuru about potential problems in the EDU world: Are You Being Used?