A tiny plugin for WordPress which converts greater than signs, smaller than signs and ampersands to html entities within pre tags. It supports semantic syntax you would use when using the Prism highlighter for example. If a code tag sits immediately within a pre tag it will not be escaped.
Code is escaped before it is displayed which gives you easy editing access in the backend as you will always see the unescaped version.
This plugin is available for download for your site.