As suggested by freakerz, I worked markItUp! into the Habari editor.
markItUp! is a very interesting JavaScript plugin. As quoted from the site, "markItUp! is not a WYSIWYG editor, and it never will be." Instead, markItUp! is a very flexible, light weight editor that can be used with a large variety of different content mediums. The button bar is fully customizable, which could maybe lend itself to some of Habari's silo functionality later on...
Here's a small preview of markItUp! in Habari --

{blog entries}
Jay Salvat
Hi!
Thank you to do me the honor of this plugin.
I would like to contact you but i don't find any contact link.
Please contact me.
Jay
markItUp! developer
April 14, 2008 2:15pm