Why the need of a preview box if you have the What You See Is What You Get Editor in the same place as your visitors type in the comments? This plugin turns the comment field from a primitive into a WYSIWYG editor, using the internal TinyMCE library bundled with WordPress 2.0 or up, without the need of another separate installation. Functions that only available to writers like adding images were removed and will not show up in the toolbar. JavaScript API TinyMCEComments provides a JavaScript function insertHTML(text) which could be used by other plugins on the same page. It is used for inserting customized content generated by other plugins into the TinyMCE editor. Akismet Some users report this plugin triggers false positives. I’m not sure, since I don’t use Akismet, but after asking help and advice from one of the developers from Akismet, they said that shouldn’t matter. But if you are one of the victims, I suggest you to switch your anti-spam plugin.
