This plugin allows you to display the meta data for a post. Just click the DPM link in the toolbar to show meta info.
This plugin was designed for the purpose of outputting the meta data associated with a WP post or page so developers and site designers can verify what information is available.
To use this plugin, simply activate then either simply navigate to a post, page or custom post type and then click on the "DPM" link in the toolbar. For those who have the toolbar disabled, setting show_meta=true in the URL will activate the meta display. Example: