We often need to mention <HTML>
<tags>
in our posts, and I was getting a bit tired of typing all the escaped angle brackets. Now, if you highlight a word, then press the "tag" button on the post editing toolbar, you'll see this:
<code><stuff></code>
which will look like this in the final post:
<stuff>
The customization was made to:
/blogs/plugins/_quicktags.plugin.php