jQuery Post Preview WordPress Plugin allows the live post preview on «Write/Edit post» page of WordPress admin area. It works on jQuery.

If you don’t like WordPress built-in Visual Editor (because it puts a lot of unnecessary tags or by any other reasons), but you want to have live post preview like in Visual Editor, this plugin may be useful for you.

Requires WordPress version: 2.5 or higher.

Download
jQuery Post Preview WordPress Plugin
Version: 0.2 | Last updated: 2012-2-18

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Installation
Upload jquery-post-preview folder to the /wp-content/plugins/ directory.
Activate the plugin through the ‘Plugins’ menu in WordPress.
Deactivate Visual Editor in your user profile.
That’s all.
Version history
Version 0.2 (02.18.12): changes to work with WordPress 3.3.
Version 0.1 (03.27.09): the initial version.