Are you using WordPress as a CMS? Are you using a backrev version of wordpress? Do you have an existing design that relies on div styling in the content area, but want to allow use of the WYSIWYG editor for most text?
It’s your lucky day, if you’re using WP 2.3. Edit the tiny_mce_config.php as outlined at this article and rejoice.
[tags]wordpress,cms,tinymce[/tags]