Suggestion

On the homepage the first thing that pops up is the demo

<!-- Create a simple CodeMirror instance -->
<link rel="stylesheet" href="lib/codemirror.css">
<script src="lib/codemirror.js"></script>
<script>
var editor = CodeMirror.fromTextArea(myTextarea, {
    lineNumbers: true
});
</script>

But it seems that this doesn’t do code highlighting without adding a mode.

<script src="mode/javascript/javascript.js"></script>

I think it would be worth adding this mode to the demo. It’s the first thing people see when they come to the website.

Also just wanted to let you know the email confirmation I received was flagged as junk by gmail.

Cheers