Active Preview provides a new preview link for users to click that creates a new preview window which is updated with changes in real-time.
This plugin provides the ability for users to preview a post or page and view in real-time the changes they are making to the page within the full context of their theme.
Please upgrade to version 1.2+ if the functionality is not working with your themes. We have updated the plugin to now work with every theme. Tell us if you still see issues.