Dan Cederholm wrote a simple utility for converting XHTML (or other code-like data) into entity-encoded markup. This is a simple perl script that’s just designed to save a bit of time when writing web content.
This looks a lot like Jon Hicks’ live comment previews. There’s just something great about seeing my input rendered by the browser as I type. It’s almost like having a WYSIWYG word processor in the browser. We need more of this kind of stuff on the web.